Patrick Proniewski: > What would be the best way to do this? > > I've though about using bcc maps, something like this: > > user1@domain user1@training.domain > user2@domain user2@training.domain > > but in case of failure on the training server side, the From: > address would get an delivery error message, right? > > Any help greatly appreciated! Patrick
Postfix built-in mechanisms to add recipients are "reliable" in the sense that the sender will be informed of delivery errors. To add a recipient without notification, use an smtpd_proxy_filter that copies command and replies without modification, and that adds the additional recipients as RCPT TO:<additional-recipient> NOTIFY=NONE (this requires Postfix 2.3 or later). SMTP proxies take a few lines of Perl, Python, etc. Wietse