>I have the same problem,
Actually, your problem is probably quite different. Although the symptoms
are the similar (some mail not reaching its destination in your case,
versus no mail reaching its destination in the other case), the cause is
different.
>the log files tell me that there is no error or other visible problem. My
>clients tell me that the emails never arrive at
>the destination and also no bounce-back-notification is send to the user
>or the postmaster.
If that is truly the case -- if you see a "rdeliver" line in the log files
-- then the problem is almost certainly on the remote end. They are
deleting your mail for some reason (AOL does this a lot). You aren't in
any spam databases, and you do have a reverse DNS entry, which is
good. The only thing I would change is your reverse DNS entry -- it has 8
different PTR records, where virtually all programs that do reverse DNS
lookups will only look at the first one that is returned. Having multiple
PTR records therefore will end up using extra bandwidth (about 10x as much
if the size of a UDP packet is exceeded, and TCP/IP is used) that won't be
used.
If you post a snippet from the log file for one of the E-mails that
disappeared, we can help determine where it was lost.
-Scott
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