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Ensuring that a mail server is responding - F-Secure Community
<main> <article class="userContent"> <p> </p> Ensuring that a mail server is responding <p>This article describes how you can check whether a mail server is responding or not. It explains how to do this in principle and provides links to more extensive troubleshooting material. </p> <p><strong>Note:</strong> This article assumes some technical knowledge of the relevant operating system. If you are unsure, please contact F-Secure support for assistance. </p> <p>Sometimes it may be necessary to test that a mail server is actually accepting mail and forwarding it on to the correct recipients. </p> <p>You can test if the network connection to the mail server is working properly by opening a telnet connection to the server. The standard SMTP port is 25. The command to do this is identical on both Linux and Windows operating systems: </p><pre class="code codeBlock" spellcheck="false">root@server $ telnet yourmailserver.com 25</pre> <p>If you get a textual response, such as the one below, it means that the network connection is working and the SMTP service is running on that mail server. </p> <pre class="code codeBlock" spellcheck="false">Trying 10.4.1.234.... Connected to yourmailserver.com. Escape character is '^]'. 220 mx.yourmailserver.com ESMTP Sendmail 8.12.9/8.12.9; Thu, 12 Jun 2009 10:06:19 +0200</pre> <p>Connection to the host lost or similar error messages mean that the connection was unsuccessful, and you should start troubleshooting by testing the network connectivity. </p> <p>Extensive troubleshooting information relevant specifically to Microsoft Exchange can be found in Microsoft's Knowledge Base at <a rel="nofollow" href="http://support.microsoft.com/kb/153119">http://support.microsoft.com/kb/153119</a>. </p> </article> </main>