Costin Guşă wrote:

however i'm wondering if my proposed implementation would *really*
catch not only all relayed mail but also internal clients sending mail
to internal clients ?

To only catch outbound mail, use something like this (note smtpd_SENDER_restrictions):

# main.cf
smtpd_sender_restrictions =
  permit_auth_destination
  static:hold

This requires the default setting "smtpd_delay_reject = yes", so don't change it.


  -- Noel Jones

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