luc...@dds.nl: > Hello, > > I am managing a Postfix mail relay service in our internal network. The > relay itself is more permissive than the downstream SMTP server. So it > is possible, and indeed it regularly happens, that my relay accepts a > message which is subsequently bounced by the downstream server. There is > no way to inform the original sender what happened to the message after > the relay accepted it. > > Is it possible to delay closing the SMTP connection from the original > sender until the response from the downstream server is received, and > then respond accordingly in the original connection? > > I could imagine this would imply some complications in terms of > performance, and the question what happens if downstream is not > available. But in the way it would appear the advantage of telling the > original sender what happened to a message, outweighs the disadvantages.
http://www.postfix.org/postconf.5.html#reject_unverified_recipient Wietse
