Squirrelmail runs on the same machine as postfix and sends mail fine when postfix is configured for smtps 465. I read smtps is deprecated so I switched postfix to submission 587 and changed the port in squirrelmail's config but squirrelmail will no longer send mail. Thunderbird sends mail fine over port 465 or 587. In squirrelmail I get: ERROR: Message not sent. Server replied: 0 Can't open SMTP stream. In the postfix log I get: [postfix/smtpd] connect from localhost[127.0.0.1] [postfix/smtpd] lost connection after UNKNOWN from localhost[127.0.0.1] [postfix/smtpd] disconnect from localhost[127.0.0.1] Does anyone know how to fix this?
You haven't shown us much information... What are your settings for SMTP?
Are you using TLS? If so, have you verified thunderbird (postfix) works with TLS or is actually really only working in plain.
What are your requirements for 587 in postfix, in smtpd_recipient_restrictions?
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