Andrew Beverley via Postfix-users:
> Hello all,
>
> I wondered if it is possible to enforce outbound (smtp) TLS based on the
> return-path of the email being sent?
>
> I know that it is possible to enforce outbound TLS using
> smtp_tls_policy_maps, but as far as I can tell rules can only be
> stipulated based on the next-hop destination, not on other parameters
> such as the return-path of the email being sent.
Use sender-dependent transport:
main.cf:
sender_dependent_default_transport_maps = inline:{
{ [email protected] = smtp-encrypt: } }
with a master.cf entry that enforces TLS:
master.cf:
smtp-encrypt .. .. .. .. .. .. .. smtp
-o { smtp_tls_security_level = encrypt }
See
https://www.postfix.org/postconf.5.html#sender_dependent_default_transport_maps
for precedence rules.
Wietse
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