For sending, it uses (like pretty much any network application) whatever the TCP stack in your OS chooses.
this may be useful https://www.postfix.org/postconf.5.html#smtp_bind_address "An optional numerical network address that the Postfix SMTP client should bind to when making an IPv4 connection." works nicely on multi-homed setups _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
