- Performance: a high load of DSN success notification requests could
slow down the queue manager. Solution: make the trace client
asynchronous, just like the bounce and defer clients.
- The local(8) delivery agent ignored table lookup errors in
mailbox_command_maps, mailbox_transport_maps, fallback_transport_maps
and (while bouncing mail to alias) alias owner lookup.
- Workaround: dbl.spamhaus.org rejects lookups with "No IP queries" even
if the name has an alphanumerical prefix. We play safe, and skip both
RHSBL and RHSWL queries for names ending in a numerical suffix.
- The "sendmail -t" command reported "protocol error" instead of "file
too large", "no space left on device" etc.
- The Postfix Milter client reported a temporary error instead of
"file too large" in three cases.
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