Bowie Bailey writes:
I'm still trying to remember why I put this setting in to begin with. I may change it back once I get this server online and see what happens. I may be wrong, but I seem to remember that I was having a problem with some ISP rejecting mail with an empty sender address
Yes, that _used_ to happen. I don't know if this stil happens, to any noticable degree.
(Yea, I know it violates the RFCs, but I think there was someone doing it anyway). It seems that I'm stuck between the possibility of generating backscatter and the possibility of losing valid email. At the moment, I consider the second to be a much more serious problem.
Using an alias file, instead of a forward through maildrop, will mitigate most of this. Forwarding mail like you're doing breaks the message's audit trail.
If you use an alias file, the default backscatter settings will drop the first bounce, but then Courier will temporarily refuse to accept any more mail, for this recipient, for some period of time. If someone tries to send mail to this recipient again, the sending server will be stuck dealing with the bounce, and legitimate senders will receive a valid bounce back from their own mail server.
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