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Exchange 2000 Security Question

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4 replies

by jedavidow

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Help! I have supposedly locked down my server from being an open Relay. (According to the tech documents at MS). However, I checked my log and every so often someone is still relaying through my system!

When messages are bounced back, this is the message they carry:

vtqi@yahoo.com.tw on Fri, 13 Sep 2002 11:47:41 -0700
There was a SMTP communication problem with the recipient's email
server. Please contact your system administrator.
" (envelope sender is )>

There is no linda defined in my Exchange Users, and I am behind a firewall (obviously,port 25 is open).

Any ideas? Today I am getting nailed with a lot of relays! What do I do?

4 replies

by acattr

Who is getting this message. "550 rejected" means relaying denied, so odviously your server is not relaying.

by jedavidow

That's the message when the message is bounced back to me from a non-exisent SPAM recipient. so OBVIOUSLY it is spamming.

by jedavidow

I have the server dump all non-delivery mail into a special account. That's where this mail comes from. I am afraid that I am only capturing bounced mail and that mail that gets delivered is going through.

So how does the machine know that a message is being sent from within my network Vs from outside the network?

If I tell the machine to only relay mail from my subnet, all inbound mail gets bounced! So right now all authenticated users can relay, and I have anonymous authentication on.

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