port 465 SSL/TLS now being pushed as preferred - IANA adds port designation submissions (submission on secure channel) · Issue #1849 · mail-in-a-box/mailinabox · GitHub
SMTP Ports: 25, 465, 587 and 2525. What SMTP Port Should I Use?
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Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
