On 2022-10-24 01:02:24 +0000, rbowman wrote: > On Mon, 24 Oct 2022 10:02:10 +1100, Cameron Simpson wrote: > > I'd say GMail are rudely dropping traffic to port 2525. Maybe try just > > 25, > > the normal SMTP port? > > 2525 is an alternative to 587, the standard TLS port.
Port 587 is not the standard TLS port. Port 587 is the standard mail
submission port (i.e., a MUA should use port 587 when sending mail; MTAs
should use port 25 when relaying mails to other MTAs).
Traffic on both port 25 and 587 starts in plain text. The server can
indicate that it supports TLS and the client can then send a STARTTLS
command to start a TLS session.
If you want to start the connection with TLS, you can (usually) use port
465. Like 587, this is only intended for mail submission, not mail
transport.
hp
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| | | h...@hjp.at | -- Charles Stross, "Creative writing
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