Amavis 0.3.12 with qmail.
Any double bounce causes infinite loop of bounces
resulting in server overload. When amavis is removed
(qmail-queue-real restored for qmai-queue) everything
returns to normal with double bouncing working ok.
Detailed analysis shows, that qmail uses the symbol <>
for the received-from field in bounces. Double bounce
is detected by qmail as a bounce which has <> in
Amavis quotes the <> symbol into "<>" which is not
recognized by qmail as double bounce. Qmail attempts to
bounce to "<>" which results in another bounce and the
infinite loop follows.
Is this just a problem in my installation? Can someone
I hacked qmail-send to discard any message addressed at
"<>", but I do not like this solution at all.