post...@ptld.com: > I do not understand how what im asking would cause a loop issue. If mail > received by submission service uses transport smtp: which then connects > to smtp:25 and smtpd service by default uses transport=virtual it would > never loop. Unless again the answer is postfix isn't designed to change > the value of -o transport in master.cf?
You want Postfix X to forward a recipient to Postfix Y (the MX). You want Postfix Y to deliver that recipient to Postfix X. That is a loop. It can be broken with multiple instances, content_filter, or smtpd_proxy_filter. You also appear to be unaware that transport_maps has no effect on the Postfix SMTP daemon. Only the parameters in http://www.postfix.org/smtpd.8.html have an effect. Wietse
