I'm setting up a web application in the AWS cloud to mail via SES. It's supposed to send out notifications using postfix with the AWS SES server configured as a smarthost. The app uses a postmaster account to send out mails. Sending out emails works fine, but I need to configure bounce handling.
The application sends out an email, if it's delivered, all is fine. But once in a while an email bounces, obvioudly.
As the web app does not include any kind of handling for incoming mail, and I do not just want to silently drop the bounce messages, I opted to forwarding the postmaster's account to an external email address via /etc/aliases. If I send an email directly to postmaster now, it's correctly send to that address. But if postfix receives a bounce, it will try to forward the bounce message and somehow the smarthost refuses the (now outgoing) bounce message with a 501 Invalid From command. If I remove the alias, the bounce is correctly delivered to the local account.
Any idea if this is solvable?
The relevant portions of the postfix log:
Outgoing mail:
postfix/pickup[1909]: 7619943922: uid=1000 from=<[email protected]>
postfix/cleanup[2164]: 7619943922: message-id=<[email protected]>
postfix/qmgr[565]: 7619943922: from=<[email protected]>, size=357, nrcpt=1 (queue active)
postfix/smtp[2166]: 7619943922: to=<[email protected]>, relay=email-smtp.eu-west-1.amazonaws.com[54.72.40.32]:25, status=sent (250 Ok ) #irrelevant things cut out
postfix/qmgr[565]: 7619943922: removed
Incoming bounce and the error when it's supposed to be forwared:
postfix/smtpd[2158]: connect from a3-182.smtp-out.eu-west-1.amazonses.com[54.240.3.182]
postfix/smtpd[2158]: 6B7E44385A: client=a3-182.smtp-out.eu-west-1.amazonses.com[54.240.3.182]
postfix/cleanup[2164]: 6B7E44385A: message-id=<[email protected]>
postfix/qmgr[565]: 6B7E44385A: from=<>, size=2305, nrcpt=1 (queue active)
postfix/cleanup[2164]: 6D93E43922: message-id=<[email protected]>
postfix/qmgr[565]: 6D93E43922: from=<>, size=2432, nrcpt=1 (queue active)
postfix/local[2167]: 6B7E44385A: to=<[email protected]>, relay=local, delay=0.01, delays=0.01/0/0/0, dsn=2.0.0, status=sent (forwarded as 6D93E43922)
postfix/qmgr[565]: 6B7E44385A: removed
postfix/smtp[2166]: 6D93E43922: to=<[email protected]>, orig_to=<[email protected]>, relay=email-smtp.eu-west-1.amazonaws.com[52.213.60.48]:25, delay=0.09, delays=0/0/0.09/0, dsn=5.0.0, status=bounced (host email-smtp.eu-west-1.amazonaws.com[52.213.60.48] said: 501 Invalid MAIL FROM address provided (in reply to MAIL FROM command))
postfix/qmgr[565]: 6D93E43922: removed
