on 2019/11/26 19:27, Matus UHLAR - fantomas wrote:
...and there's no "starttls" on 465, that's what I meant "implicit".

while port 465 was assigned for SMTPS in January 2018, it's been used this
way on many sites/services for years (even decades)

On 26.11.19 20:50, Wesley Peng wrote:
How the traffic between big one's MTAs get through?

port 25 as always/before

For example, gmail send messages to web.de via port 465 by SSL,

this was the original intent of port 465, but it was deprecated 20 years ago
and never user. Port 465 was used for smtp with implicit SSL since.



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