Bypassing Hetzner mail port block (port 25/465) - Jan van den Berg
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Sender-dependent transports with transport encryption on port 465 fails · Issue #2881 · mailcow/mailcow-dockerized · GitHub
Enable SMTPS Port 465 in Postfix SMTP Server For Email Submission
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google compute engine - Port 465 - not working in GCP - Server Fault
Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
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Which SMTP Port Should I Use? Understanding Ports 25, 465, & 587 | Mailgun
Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
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Connection - SMTP
Enable SMTPS Port 465 in Postfix SMTP Server For Email Submission
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
