No, this is not possible. You have a fundamental misunderstanding of how email works. The "reply-to" field is part of the message content. A 550 rejection happens before the SMTP client even gets to start sending message content. In other words, the 550 rejection occurs based on the message envelope; the message contents are never seen by the server. You need to fix your app so that it uses a valid envelope from address.
** Changed in: postfix (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1468172 Title: Upon 550-5.1.1 errors, send report to replyTo instead To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1468172/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs