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- 12:23, 4 October 2023 Admin talk contribs created page Using Telnet with SMTP (Created page with "== The Old Way == To connect to a server using Telnet you would run the following command. telnet mail.example.com 25 However, you're not going to get very far. Unencrypted Telnet is a no-no for most mail servers and they'll cut you off right there. == Using OpenSSL to Connect Securely == Luckily, you can get around this by using the wonderful <code>openssl</code> tool/library to wrap your telnet session in a warm security blanket weaved from the finest encryption...")