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Postfix doesn't evaluate the smtpd_client_restrictions until the RCPT TO (or ETRN) command is sent. http://www.postfix.org/SMTPD_ACCESS_README.html#timing Current Postfix versions postpone the evaluation of client, helo and sender restriction lists until the RCPT TO or ETRN command. This behavior is controlled by the smtpd_delay_reject parameter. ...


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The biggest difference between POP3 and IMAP from a user's perspective is that POP3 is designed to hold mail until the client (Thunderbird in this case) downloads the mail, at which point it's removed from the POP3 server (it can be configured to do otherwise, but that's not the norm). IMAP on the other hand, is the opposite. It is designed to be the ...


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I'm going to answer my own question. First I did the following: semodule -l | grep mymodulename (Replace mymodulename with any previous modules you may have imported). Skip this step if you haven't previously imported any modules. Then run this command to remove any previously imported modules. Again skip this step if you haven't imported any previous ...


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First try basic connectivity to your destination. telnet smtp.gmail.com 587 If that doesn't work you're probably looking at a firewall issue. Check that your TLS works openssl s_client -starttls smtp -crlf -connect smtp.gmail.com:587 If the first worked but TLS fails you are probably using a deep inspection firewall that blocks you from using TLS ...


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IIRC, openssl s_client -connect localhost uses TLS by default. From https://www.openssl.org/docs/apps/s_client.html: -ssl2, -ssl3, -tls1, -no_ssl2, -no_ssl3, -no_tls1 These options disable the use of certain SSL or TLS protocols. By default the initial handshake uses a method which should be compatible with all servers and permit them to use SSL ...



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