Hi,
You need to make sure that only the FE is connected to the internet or at least no one can connect to your BE from the outside world at all, only on the FE on port 25.
Then you need to check on ONLY THE LIST BELOW, leave the list empty and then check on allow users who can successfully authenticate to relay. this settings should be on both servers.
And then try to telnet on the FE and the BE and check where is the problem, only make sure to telnet without a firewall in between.
once you closed the relay it doesn't mean that the queues will be empty you need to follow: http://support.microsoft.c
I hope that helps.
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by: inbarasanPosted on 2007-09-17 at 10:54:41ID: 19906800
Pls check the link below to find if you are open relay and also to take corrective action
ange/smtp- openrelay. asp
http://www.amset.info/exch