TLS: certificates, STARTTLS and ports

50 min Python 3.12 (Debian, git, pip) Versions Postfix 3.5 à 3.10, Dovecot 2.3 / 2.4

Objective

Encrypt every step of the mail: between users and the server (mandatory), between servers (as often as possible), with a valid certificate that carries the right names and renews without incident.

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