A quick summary of our setup. We accept mail for customers, filter the mail and then forward it on to their server.
To prevent backscatter we do not accept any mail for an email address that does not exist at a domain. A problem we run into however is if our customers servers (where we deliver their mail) has spam protection (a 2nd level, which we do not recommend) they may reject the mail. We often see stuff like this, when trying to deliver to the customer server: 550 5.7.1 Message rejected as spam by Content Filtering. We have no way to know if the destination server will accept the message when we accept it on their behalf. We trap those errors (delivery failures we call them) and report them to the users. Our Exim server handles the undelivered and sends a bounce back to the original sender. If it is a problem like a full mailbox, temporary error etc. etc. we want to send back an undelivered notice. In the case where our customer is rejecting the messages because of some spam block we would rather not send back any undelivered notice. Essentially we want to control what undelivered notices we actually send. Any way to do this? Selectively choose what undelivered notices to send back to the original sender? -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
