On Mon, May 24, 2010 at 2:25 PM, John Adams <mailingli...@belfin.ch> wrote:
> On 24.05.2010 20:05, Linux Addict wrote: > >> Hello, One of my postfix server is sending thousands of messages to >> non-existent mail box in another internal server. The internal >> application sends mail as mailb...@domain.net >> <mailto:mailb...@domain.net> thru postfix. The TO addresses are invalid. >> >> I need reject messages from those domains not resolved. >> >> >> >> to=<dmr0613420524125827...@dsaperftest.edu >> <mailto:dmr0613420524125827...@dsaperftest.edu>>, relay=none, >> >> delay=0.05, delays=0.01/0/0.04/0, dsn=5.4.4, status=bounced (Host or >> domain name not found. Name service error for name=dsaperftest.edu >> <http://dsaperftest.edu> type=A: Host not found) >> >> thank you >> LA >> > > > Well, if its one of your hosts doing the spamming turn of the application > that is causing it. Or blacklist the sender host's IP address on the first > receiving smtp server. Or do some sender address verification on your mail > gateway (or however your email architecture looks like - I have no idea). > The postfix MX are behind a load balancer so they dont show the actual IP. I stopped the postfix, then did postcat on one of the queued message and found the spam host. thanks for your help.
