We recently had a problem with duplicated messages on one of our
Majordomo mailing lists which was tracked down to a new subscriber who
was using MDaemon. Apparently MDaemon doesn't cope very well with
mailing lists; it needs a local alias (or "routing rule") mapping the
mailing list address to local recipients. Without this it resends the
message back to the mailing list!
Is this a generally known about problem?
Does it only affect lists managed by Majordomo? (using resend)
Is there any way to guard against it?