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Fallback from the Submission port to the SMTP port
![TCP Source Port]](https://www.manual.sato-global.com/printer/clnxplus/images/GUID-CC50C560-01BB-4316-969D-1D43A3BB81D8-low.png "TCP Source Port]")
TCP Source Port]
Sender-dependent transports with transport encryption on port 465 fails · Issue #2881 · mailcow/mailcow-dockerized · GitHub
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Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
TCP/UDPポート番号一覧
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Which SMTP Port to Use for Email: 25, 587, 465, or 2525?
