Viktor Dukhovni via Postfix-users: > > but I can guess it would be quite complex change, so well... if there > > would ability to reply with 5xx error for detected expansion loop, I > > think moving alias map to the incoming MX MTA would be enough + > > setting transport map for a next hop of all emails. > > I don't think this is a sound feature to add, it would be misunderstood > by naive users.
This reminds me of a similar concern that we had in mail delivering contexts. In the mail receiving context, the solution would be to implement smtpd_delivery_status_filter, similar in purpose to smtp_delivery_status_filter (the initial problem there was how to make Postfix more aggressive about TLS handshake failures). This should be feasible because all SMTP server responses are formatted in one place. When the filter is implemented as a regexp map, this also provides a maximal amount of rope to shoot yourself in the foot with. There are some details to decide, like how this would interact with smtpd_reject_footer (and smtpd_reject_footer_maps); and there have to be guard rails (one cannot change reject into accept, or vice versa). Wietse _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org