Qmail and bounces
I have a mail server running a cluster of back-end stores (because no single
server can handle the load) and Qmail-ldap for the front-end to send the
message to the appropriate back-end machine.
The problem is that Qmail is accepting messages for non-existant destinations
(IE mail for email@example.com when there is not account named "user" in the
LDAP directory). Ideally Qmail would reject the message with a SMTP 550
code. However then Qmail will repeatedly try to deliver the message
"locally" to the back-end machine but aborts every time because it's not in
the LDAP (one message had 17 delivery attempts).
Any suggestions for what to do about this?
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