Mail blocked from an entire company?
- From: "Rogers, Brian" <RogersB@xxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 12 Jun 2003 10:53:29 -0400
Recently we received a call from one of our customers complaining that all
email from that customer was not being received. After a bit of
troubleshooting, we discovered in the logs that all packets were being
dropped from that customers mail server by the firewall service.
Now we have a mail publishing rule that has been working fine for over a
year...we send and receive email just fine over the internet with that
published Exchange 5.5 bridgehead. Why on earth would it single out one
particular mail server to drop all packets from? The only solution we could
come up with was to create a packet filter to specifically allow traffic
from that remote IP...to the published IP on the ISA server and everything
worked fine.
I had verified the mail publishing rule, verified there are no other packet
filters configured to deny traffic like this...I simply cant figure out what
went wrong here. I can see no configuration changes from when it was
working fine..till now.
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