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Forcing TLS encryption with MS Exchange - F-Secure Community
<main> <article class="userContent"> <p> </p> Forcing TLS encryption with MS Exchange <p>This article describes how you can force TLS encryption with Microsoft Exchange. </p> <p>Do as follows: </p> <ol><li> Make sure that Exchange can handle inbound mail traffic with TLS. Establish a connection to the email server port 25. Run the following command: <pre class="code codeBlock" spellcheck="false">telnet youdomainhere.com 25</pre>: <p><img src="https://us.v-cdn.net/6032052/uploads/815/FPX44IBLLQSC.png" alt="image" class="embedImage-img importedEmbed-img"></img></p> </li> <li> If you can see STARTTLS, Exchange is able to use TLS: <p><img src="https://us.v-cdn.net/6032052/uploads/824/L5C90RXQ4ZE9.png" alt="image" class="embedImage-img importedEmbed-img"></img></p> </li> <li> Go to <strong>System</strong> > <strong>SMTP Encryption</strong> > <strong>Settings</strong> and set <strong>Enable TLS</strong> to On: <p><img src="https://us.v-cdn.net/6032052/uploads/975/N0L2WPKCOKON.png" alt="image" class="embedImage-img importedEmbed-img"></img></p> </li> <li> Go to <strong>System</strong> > <strong>SMTP Encryption</strong> > <strong>TLS Settings</strong> and add your email server IP address to the list with following settings: <p><img src="https://us.v-cdn.net/6032052/uploads/241/DUAQYWD91QZ6.png" alt="image" class="embedImage-img importedEmbed-img"></img></p> </li> </ol> </article> </main>