On Tue, 26 Nov 2019, Wesley Peng wrote:

on 2019/11/26 17:02, Matus UHLAR - fantomas wrote:
I would set up port 465 also. Note that TLS on 465 is implicit, while on 587 is
explicit, so it's easier to allow unencrypted connections by a mistake on
587.

587 is also used for StartTLS, am I right?

Yup, that's what Matus meant with "explicit". Connection starts in clear text and is then (explicitly :) "upgraded" to TLS.

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