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Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
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Sender-dependent transports with transport encryption on port 465 fails · Issue #2881 · mailcow/mailcow-dockerized · GitHub
Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
Fallback from the Submission port to the SMTP port
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