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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html><head> <meta name="description" content="AWStats Documentation - Glossary of terms"> <meta name="keywords" content="awstats, awstat, glossary, terms, definition, lexical, index"> <meta name="robots" content="index,follow"> <meta name="title" content="AWStats Documentation - Glossary"><title>AWStats Documentation - Glossary</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <link rel="stylesheet" href="styles.css" type="text/css"> </head> <body topmargin="10" leftmargin="5"> <table style="font-family: arial,helvetica,verdana; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%"> <!-- Large --> <tbody> <tr style="font-family: arial,helvetica,verdana; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"> <td align="center" bgcolor="#9999cc"><a href="/"><img src="images/awstats_logo6.png" border="0"></a></td> <td align="center" bgcolor="#9999cc"> <br> <font style="font-family: arial,helvetica,sans-serif; font-style: normal; font-variant: normal; font-weight: normal; font-size: 16pt; line-height: normal; font-size-adjust: none; font-stretch: normal;" color="#eeeeff"><b>AWStats logfile analyzer 7.8 Documentation</b></font><br> <br> </td> <td align="center" bgcolor="#9999cc"> </td> </tr> </tbody> </table> <br> <br> <h1 style="font-family: arial,helvetica,sans-serif; font-style: normal; font-variant: normal; font-weight: normal; font-size: 26px; line-height: normal; font-size-adjust: none; font-stretch: normal;">Glossary</h1> <br> <a name="Unique Visitor"><b>Unique Visitor</b></a>:<br> A unique visitor is a person or computer (host) that has made at least 1 hit on 1 page of your web site during the current period shown by the report. If this user makes several visits during this period, it is counted only once. Visitors are tracked by IP address, so if multiple users are accessing your site from the same IP (such as a home or office network), they will be counted as a single unique visitor.<br> The period shown by AWStats reports is by default the current month.<br> However if you use AWStats as a CGI you can click on the "year" link to have a report for all the year. In such a report, period is a full year, so Unique Visitors are number of hosts that have made at least 1 hit on 1 page of your web site during the year.<br> <hr> <a name="Visits"><b>Visits</b></a>:<br> Number of visits made by all visitors.<br> Think "session" here, say a unique IP accesses a page, and then requests three other pages within an hour. All of the "pages" are included in the visit, therefore you should expect multiple pages per visit and multiple visits per unique visitor (assuming that some of the unique IPs are logged with more than an hour between requests)<br> <hr> <a name="Pages"><b>Pages</b></a>:<br> The number of "pages" viewed by visitors. Pages are usually HTML, PHP or ASP files, not images or other files requested as a result of loading a "Page" (like js,css... files). Files listed in the NotPageList config parameter (and match an entry of OnlyFiles config parameter if used) are not counted as "Pages". <hr><a name="Hits"><b>Hits</b></a>:<br> Any files requested from the server (including files that are "Pages") except those that match the SkipFiles config parameter.<br> <hr> <a name="Bandwidth"><b>Bandwidth</b></a>:<br> Total number of bytes for pages, images and files downloaded by web browsing.<br> Note 1: Of course, this number includes only traffic for web only (or mail only, or ftp only depending on value of LogType).<br> Note 2: This number does not include technical header data size used inside the HTTP or HTTPS protocol or by protocols at a lower level (TCP, IP...).<br> Because of two previous notes, this number is often lower than bandwith reported by your provider (your provider counts in most cases bandwitdh at a lower level and includes all IP and UDP traffic).<br> <hr> <a name="Entry Page"><b>Entry Page</b></a>:<br> First page viewed by a visitor during its visit.<br> Note: When a visit started at end of month to end at beginning of next month, you might have an Entry page for the month report and no Exit pages.<br> That's why Entry pages can be different than Exit pages.<br> <hr> <a name="Exit Page"><b>Exit Page</b></a>:<br> Last page viewed by a visitor during its visit.<br> Note: When a visit started at end of month to end at beginning of next month, you might have an Entry page for the month report and no Exit pages.<br> That's why Entry pages can be different than Exit pages.<br> <hr> <a name="Session Duration"><b>Session Duration</b></a>:<br> The time a visitor spent on your site for each visit.<br> Some Visits durations are 'unknown' because they can't always be calculated. This is the major reason for this:<br> - Visit was not finished when 'update' occured.<br> - Visit started the last hour (after 23:00) of the last day of a month (A technical reason prevents AWStats from calculating duration of such sessions).<br> <hr> <a name="Grabber"><b>Grabber</b></a>:<br> A browser that is used primarily for copying locally an entire site. These include for example "teleport", "webcapture", "webcopier"...<br> <hr> <a name="Direct"><b>Direct access / Bookmark</b></a>:<br> This number represent the number of hits or ratio of hits when a visit to your site comes from a direct access. This means the first page of your web site was called:<br> - By typing your URL on the web browser address bar<br> - By clicking on your URL stored by a visitor inside its favorites<br> - By clicking on your URL found everywhere but not another internet web pages (a link in a document, an application, etc...)<br> - Clicking an URL of your site inside a mail is often counted here.<br> <hr> <a name="AddToFavourites"><b>Add To Favourites</b></a>:<br> This value, available in the "miscellanous chart", reports an estimated indicator that can be used to have an idea of the number of times a visitor has added your web site into its favourite bookmarks.<br> The technical rules for that is the following formula:<br> <i>Number of Add to Favourites = round((x+y) / r)</i><br> where<br> x = Number of hits made by IE browsers for "/anydir/favicon.ico", with a referer field not defined, and with no 404 error code<br> y = Number of hits made by IE browsers for "/favicon.ico", with a referer field not defined, with or without 404 error code<br> r = Ratio of hits made by IE browsers compared to hits made by all browsers (r <= 1)<br> <br> As you can see in formula, only IE is used to count reliable "add", the "Add to favourites" for other browsers are estimated using ratio of other browsers usage compared to ratio of IE usage. The reason is that only IE do a hit on favicon.ico nearly ONLY when a user add the page to its favourites. The other browsers make often hits on this file also for other reasons so we can't count one "hit" as one "add" since it might be a hit for another reason.<br> AWStats differentiate also hits with error and not to avoid counting multiple hits made recursively in upper path when favicon.ico file is not found in deeper directory of path.<br> Note that this number is just an indicator that is in most case higher than true value. The reason is that even IE browser sometimes make hit on favicon without an "Add to favourites" action by a user. <hr><a name="HTTP"><b>HTTP Status Codes</b></a>:<br> HTTP status codes are returned by web servers to indicate the status of a request. Codes <b>200</b> and <b>304</b> are used to tell the browser the page can be viewed. <span style="font-weight: bold;">206</span> codes indicate partial downloading of content and is reported in the Downloads section. All other codes generates hits and traffic 'not seen' by the visitor. For example a return code 301 or 302 will tell the browser to ask another page. The browser will do another hit and should finaly receive the page with a return code <b>200</b> and <b>304</b>. All codes that are 'unseen' traffic are isolated by AWStats in the HTTP Status report chart, enabled by the directives <a href="awstats_config.html#Show">ShowHTTPErrorsStats</a>. in config file. You can also change value for 'not error' hits (set by default to <b>200</b> and <b>304</b> with the <a href="awstats_config.html#ValidHTTPcodes">ValidHTTPcodes</a> directive. The following table outlines all status codes defined for the HTTP/1.1 draft specification outlined in <a href="http://www.w3.org/Protocols/rfc2068/rfc2068">IETF rfc 2068</a>.<br> They are 3-digit codes where the first digit of this code identifies the class of the status code and the remaining 2 digits correspond to the specific condition within the response class. They are classified in 5 categories:<br> <ul> <li><font face="arial"><font size="-1"><a href="#1">1xx - informational</a></font></font></li> <li><font face="arial"><font size="-1"><a href="#2">2xx - successful</a></font></font></li> <li><font face="arial"><font size="-1"><a href="#3">3xx - redirection</a></font></font></li> <li><font face="arial"><font size="-1"><a href="#4">4xx - client error </a></font></font></li> <li><font face="arial"><font size="-1"><a href="#5">5xx - server error </a></font></font></li> </ul> <table width="90%"> <tbody> <tr> <td bgcolor="#dadada" valign="top"><!-- HTTP 1xx codes --> <a name="1"></a><b><font face="arial">1xx class - Informational</font></b> <br> <font face="arial"><font size="-1">Informational status codes are provisional responses from the web server... they give the client a heads-up on what the server is doing. Informational codes do not indicate an error condition. </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">100</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">100 Continue</font></font></b> <br> <font face="arial"><font size="-1">The continue status code tells the browser to continue sending a request to the server. </font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">101</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">101 Switching Protocols</font></font></b> <br> <font face="arial"><font size="-1">The server sends this response when the client asks to switch from HTTP/1.0 to HTTP/1.1 </font></font></td> </tr> </tbody> </table> <p><a name="2"></a><b><font face="arial">2xx class - Successful</font></b> <br> <font face="arial"><font size="-1">This class of status code indicates that the client's request was received, understood, and successful. </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">200</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">200 Successful</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">201</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">201 Created</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">202</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">202 Accepted</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">203</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">203 Non-Authorative Information</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">204</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">204 No Content</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">205</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">205 Reset Content</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">206</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">206 Partial Content</font></font></b> <br> <font face="arial"><font size="-1">The partial content success code is issued when the server fulfills a partial GET request. This happens when the client is downloading a multi-part document or part of a larger file. </font></font></td> </tr> </tbody> </table> <!-- HTTP 3xx codes --> <a name="3"></a><b><font face="arial">3xx class - Redirection</font></b> <br> <font face="arial"><font size="-1">This code tells the client that the browser should be redirected to another URL in order to complete the request. This is not an error condition. </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">300</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">300 Multiple Choices</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">301</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">301 Moved Permanently</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">302</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">302 Moved Temporarily</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">303</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">303 See Other</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">304</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">304 Not Modified</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">305</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">305 Use Proxy</font></font></b></td> </tr> </tbody> </table> <!-- HTTP 4xx codes --> <a name="4"></a><b><font face="arial">4xx class - Client Error</font></b> <br> <font face="arial"><font size="-1">This status code indicates that the client has sent bad data or a malformed request to the server. Client errors are generally issued by the webserver when a client tries to gain access to a protected area using a bad username and password. </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">400</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">400 Bad Request</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">401</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">401 Unauthorized</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">402</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">402 Payment Required</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">403</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">403 Forbidden</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">404</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">404 Not Found</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">405</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">400 Method Not Allowed</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">406</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">400 Not Acceptable</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">407</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">400 Proxy Authentication Required</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">408</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">400 Request Timeout</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">409</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">409 Conflict</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">410</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">410 Gone</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">411</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">411 Length Required</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">412</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">412 Precondition Failed</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">413</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">413 Request Entity Too Long</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">414</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">414 Request-URI Too Long</font></font></b></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">415</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">415 Unsupported Media Type</font></font></b></td> </tr> </tbody> </table> <!-- HTTP 5xx codes --> <a name="5"></a><b><font face="arial">5xx class - Server Error</font></b> <br> <font face="arial"><font size="-1">This status code indicates that the client's request couldn't be succesfully processed due to some internal error in the web server. These error codes may indicate something is seriously wrong with the web server. </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">500</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">500 Internal Server Error</font></font></b> <br> <font face="arial"><font size="-1">An internal server error has caused the server to abort your request. This is an error condition that may also indicate a misconfiguration with the web server. However, the most common reason for 500 server errors is when you try to execute a script that has syntax errors. </font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">501</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">501 Not Implemented</font></font></b> <br> <font face="arial"><font size="-1">This code is generated by a webserver when the client requests a service that is not implemented on the server. Typically, not implemented codes are returned when a client attempts to POST data to a non-CGI (ie, the form action tag refers to a non-executable file). </font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">502</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">502 Bad Gateway</font></font></b> <br> <font face="arial"><font size="-1">The server, when acting as a proxy, issues this response when it receives a bad response from an upstream or support server. </font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">503</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">503 Service Unavailable</font></font></b> <br> <font face="arial"><font size="-1">The web server is too busy processing current requests to listen to a new client. This error represents a serious problem with the webserver (normally solved with a reboot). </font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">504</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">504 Gateway Timeout</font></font></b> <br> <font face="arial"><font size="-1">Gateway timeouts are normally issued by proxy servers when an upstream or support server doesn't respond to a request in a timely fashion. </font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">505</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">505 HTTP Version Not Supported</font></font></b> <br> <font face="arial"><font size="-1">The server issues this status code when a client tries to talk using an HTTP protocol that the server doesn't support or is configured to ignore.</font></font></td> </tr> </tbody> </table> </p> </td> <td align="left" valign="top"></td> </tr> </tbody> </table> <br> <hr> <a name="SMTP"><b>SMTP Status Codes</b></a><a>:<br> SMTP status codes are returned by mail servers to indicate the status of a sending/receiving mail. The status code depends on mail server and preprocessor used to analyze log file.<br> All codes that are failure codes are isolated by AWStats in the SMTP Status report chart, enabled by the directives </a><a href="awstats_config.html#Show">ShowSMTPErrorsStats</a> in AWStats config file. You can decide which codes are successfull mail transfer that should not appear in this chart with the <a href="awstats_config.html#ValidSMTPCodes">ValidSMTPCodes</a> directive.<br> Here are values reported for most mail servers (This should also be values when mail log file is preprocessing with maillogconvert.pl).<br> SMTP Errors are classified in 3 categories:<br> <ul> <li><font face="arial"><font size="-1"><a href="#SMTP23">2xx/3xx - successful</a></font></font></li> <li><font face="arial"><font size="-1"><a href="#SMTP4">4xx - failure, asking sender to try later</a></font></font></li> <li><font face="arial"><font size="-1"><a href="#SMTP5">5xx - permanent failure</a></font></font></li> </ul> <table width="90%"> <tbody> <tr> <td bgcolor="#dadada" valign="top"><!-- SMTP 2xx/3xx --> <a name="SMTP23"></a><b><font face="arial">2xx/3xx class - Success</font></b> <br> <font face="arial"><font size="-1">They are SMTP protocols successfull answers </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">200</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">200 Non standard success response</font></font></b> <br> <font face="arial"><font size="-1">Non standard success response</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">211</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">211 System status, or system help reply</font></font></b> <br> <font face="arial"><font size="-1">System status, or system help reply</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">214</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">214 Help message</font></font></b> <br> <font face="arial"><font size="-1">Help message</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">220</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">220 <domain> Service ready</domain></font></font></b> <br> <font face="arial"><font size="-1"><domain> Service ready</domain></font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">221</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">221 <domain> Service closing transmission channel</domain></font></font></b> <br> <font face="arial"><font size="-1"><domain> Service closing transmission channel</domain></font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">250</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">250 Requested mail action taken and completed</font></font></b> <br> <font face="arial"><font size="-1">Your ISP mail server have successfully executes a command and the DNS is reporting a positive delivery.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">251</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">251 User not local: will forward to <forward-path></forward-path></font></font></b> <br> <font face="arial"><font size="-1">Your message to a specified email address is not local to the mail server, but it will accept and forward the message to a different recipient email address.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">252</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">252 Recipient cannot be verified</font></font></b> <br> <font face="arial"><font size="-1">Recipient cannot be verified but mail server accepts the message and attempts delivery</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">354</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">354 Start mail input and end with <crlf>.<crlf></crlf></crlf></font></font></b> <br> <font face="arial"><font size="-1">Indicates mail server is ready to accept the message or instruct your mail client to send the message body after the mail server have received the message headers.</font></font></td> </tr> </tbody> </table> <!-- SMTP 4xx --> <a name="SMTP4"></a><b><font face="arial">4xx class - Temporary Errors</font></b> <br> <font face="arial"><font size="-1">Those codes are temporary error message. They are used to tell client sender that an error occured but he can try to solve it but trying again, so in most cases, clients that receive such codes will keep the mail in their queue and will try again later.<br> </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">421</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">421 <domain> Service not available, closing transmission channel</domain></font></font></b> <br> <font face="arial"><font size="-1">This may be a reply to any command if the service knows it must shut down.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">450</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">450 Requested mail action not taken: mailbox busy or access denied</font></font></b> <br> <font face="arial"><font size="-1">Your ISP mail server indicates that an email address does not exist or the mailbox is busy. It could be the network connection went down while sending, or it could also happen if the remote mail server does not want to accept mail from you for some reason i.e. (IP address, From address, Recipient, etc.)</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">451</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">451 Requested mail action aborted: error in processing</font></font></b> <br> <font face="arial"><font size="-1">Your ISP mail server indicates that the mailing has been interrupted, usually due to overloading from too many messages or transient failure is one in which the message sent is valid, but some temporary event prevents the successful sending of the message. Sending in the future may be successful.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">452</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">452 Requested mail action not taken: insufficient system storage</font></font></b> <br> <font face="arial"><font size="-1">Your ISP mail server indicates, probable overloading from too many messages and sending in the future may be successful.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">453</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">453 Too many messages</font></font></b> <br> <font face="arial"><font size="-1">Some mail servers have the option to reduce the number of concurrent connection and also the number of messages sent per connection. If you have a lot of messages queued up it could go over the max number of messages per connection. To see if this is the case you can try submitting only a few messages to that domain at a time and then keep increasing the number until you find the maximum number accepted by the server.</font></font></td> </tr> </tbody> </table> <!-- SMTP 5xx --> <a name="SMTP5"></a><b><font face="arial">5xx class - Permanent Errors</font></b> <br> <font face="arial"><font size="-1">This are permanent error codes. Mail transfer is definitly a failure. No other try will be done. </font></font> <table width="100%"> <tbody> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">500</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">500 Syntax error, command unrecognized or command line too long</font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">501</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">501 Syntax error in parameters or arguments</font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">502</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">502 Command not implemented</font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">503</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">503 Server encountered bad sequence of commands</font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">504</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">504 Command parameter not implemented</font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">521</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">521 <domain> does not accept mail or closing transmission channel</domain></font></font></b> <br> <font face="arial"><font size="-1">You must be pop-authenticated before you can use this SMTP server and you must use your mail address for the Sender/From field.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">530</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">530 Access denied</font></font></b> <br> <font face="arial"><font size="-1">A sendmailism ?</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">550</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">550 Requested mail action not taken (Relaying not allowed, Unknown recipient user, ...)</font></font></b> <br> <font face="arial"><font size="-1">Sending an email to recipients outside of your domain are not allowed or your mail server does not know that you have access to use it for relaying messages and authentication is required. Or to prevent the sending of SPAM some mail servers will not allow (relay) send mail to any e-mail using another company’s network and computer resources.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">551</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">551 User not local: please try <forward-path> or Invalid Address: Relay request denied</forward-path></font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">552</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">552 Requested mail action aborted: exceeded storage allocation</font></font></b> <br> <font face="arial"><font size="-1">ISP mail server indicates, probable overloading from too many messages.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">553</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">553 Requested mail action not taken: mailbox name not allowed</font></font></b> <br> <font face="arial"><font size="-1">Some mail servers have the option to reduce the number of concurrent connection and also the number of messages sent per connection. If you have a lot of messages queued up (being sent) for a domain, it could go over the maximum number of messages per connection and/or some change to the message and/or destination must be made for successful delivery.</font></font></td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">554</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">554 Requested mail action rejected: access denied</font></font></b> </td> </tr> <tr> <td align="center" bgcolor="#eeeeee" valign="top" width="80"><b><font face="arial"><font size="-1">557</font></font></b></td> <td bgcolor="#eeeeff" valign="top"><b><font face="arial"><font size="-1">557 Too many duplicate messages</font></font></b> <br> <font face="arial"><font size="-1">Resource temporarily unavailable Indicates (probable) that there is some kind of anti-spam system on the mail server.</font></font></td> </tr> <!-- # Postfix code for access_map_reject_code (postfix default=554) with access_map_reject_code rule '570'=>'Access denied: access_map violation (on SMTP client or HELO hostname, sender or recipient email address)', # Postfix code for maps_rbl_reject_code (postfix default=554) with maps_rbl_code rule '571'=>'Access denied: SMTP client listed in RBL', # Postfix code for relay_domains_reject_code (postfix default=554) with relay_domains_reject rule '572'=>'Access denied: Relay not authorized or not local host not a gateway', # Postfix code for unknown_client_reject_code (postfix default=450) with reject_unknown_client rule '573'=>'Access denied: Unknown SMTP client hostname (without DNS A or MX record)', # Postfix code for invalid_hostname_reject_code (postfix default=501) with reject_invalid_hostname rule '574'=>'Access denied: Bad syntax for client HELO hostname (Not RFC compliant)', # Postfix code for reject_code (postfix default=554) with smtpd_client_restrictions '575'=>'Access denied: SMTP client hostname rejected', # Postfix code for unknown_address_reject_code (postfix default=450) with reject_unknown_sender_domain or reject_unknown_recipient_domain rule '576'=>'Access denied: Unknown domain for sender or recipient email address (without DNS A or MX record)', # Postfix code for unknown_hostname_reject_code (postfix default=501) with reject_unknown_hostname rule '577'=>'Access denied: Unknown client HELO hostname (without DNS A or MX record)', # Postfix code for non_fqdn_reject_code (Postfix default=504) with reject_non_fqdn_hostname, reject_non_fqdn_sender or reject_non_fqdn_recipient rule '578'=>'Access denied: Invalid domain for client HELO hostname, sender or recipient email address (not FQDN)', --> </tbody> </table> </td> <td align="left" valign="top"></td> </tr> </tbody> </table> <br> <hr> <!-- You can remove this part if you distribution need documentation without external tags --> <!-- BEGIN_SOCIAL_NETWORKS --> <div class="htmldoc-ignore"> <!-- google plus --> <span style="color: #bbb; font-weight: normal;">Article written by <a href="https://www.destailleur.fr/awstats.php?category=awstats?rel=author" rel="author" style="color: #ccc; font-weight: normal;">Laurent Destailleur</a>.</span><br> <br> <!-- twitter --> <a href="https://twitter.com/awstats_project" class="twitter-follow-button" data-show-count="false">Follow @awstats_project</a> </div> <!-- END_SOCIAL_NETWORKS --> </body></html>