Hi, I am using Postfix for some time now and up to now I could always make it behave the way it should. However, I have a problem now:
I use virtual_alias_maps (with mysql backend, not that it would matter) to sort mail into local user's mailboxes, but also sometimes to forward mail to external mail addresses (upon user request). I know that this kind of forwarding is not always the best, but it works most of the time. This forwarding to external addresses however, makes my Postfix create backscatter. Example: hijac...@yahoo.example.com sends email to u...@mysystem.com -> virtual_alias_maps says: deliver it to interestedpa...@gmx.example.com However, the mail server at gmx.example.com may sometimes reject the message for any reason, which causes my Postfix to generate a bounce message to hijac...@yahoo.example.com - which is obviously not something anyone would want. Any proposed solutions I found always attacked the problem either using spam filters (not applicable in this case) or changes in the receiving mail server (how would I convince any bigger email provider to do that?). The backscatter FAQ about Postfix gives loads of things to do for preventing incoming backscatter, but now Postfix is generating the backscatter. How do I stop it from doing so? Thanks, Stefan
