I've setup Postfix so that email clients use port 465 (smtps) for outbound mail. I'm not really understanding the difference between smtps (port 465) and submission (port 587) What's the …

Oct 24, 2020 · SMTP session to smtps (465) port using telnet Connections to smtp (25) start as unencrypted. Connections to smtps (465) start/negotiate encryption before any SMTP protocol …

I'm aware that Exchange supports opportunistic TLS (STARTTLS). But can I create a SMTPS receive connector (plain SSL)?

Jul 19, 2011 · I have a SSL certificate setup for postfix and Dovecot. I am able to read mail from Dovecot using a TLS connection but I cannot send any mail using smtps. I can only do it …

Mar 5, 2021 · STARTTLS was indeed intended to deprecate the "duplicated" ports, one with encryption and one without, but it is STARTTLS that is being effectively deprecated. RFC 8314 …

I have Postfix and I've configured it to listen on port 465 for SMTPS. When I telnet to port 465, it does not respond but it does respond on port 25. I've googled for days and nothing has worked ...

Nov 17, 2020 · That did the trick. Thanks so much!. Configuring for port 465 left this notice in the logs SMTPS wrappermode (TCP port 465) requires setting "smtp_tls_wrappermode = yes", …

Dec 18, 2020 · I enabled port 465, by uncommenting these lines in master.cf: smtps inet n - y - - smtpd -o smtpd_sasl_auth_enable=yes -o smtpd_reject_unlisted_recipient=no ...

Aug 15, 2020 · I've got an Ubuntu 20.04 server that's receiving hundreds of SMTP AUTH requests on my postfix server every day from the same IP. I have fail2ban installed, but …

postfix/smtpd - This is typically the SMTP daemon process for handling incoming mail and routing to the appropriate internal location. postfix/smtp - This is typically the SMTP daemon process …