Receiving 220 ********** on telnet to port 25

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Howdy,

I have an Exhange 2003 server behind a Cisco PIX-501 6.3 firewall. I have SMTP port 25 traffic open from external to the Exchange server. When I run the command "telnet mail.domain.com 25" I get the following response

220 **********************************************************************0****0
**********************2*****200*********2**0*00

helo command doesn't work, only thing that does is quit. If I run the same command at the console, "telnet 192.168.0.10 25" I get:

220 mail.domain.com Microsoft ESMTP MAIL Service, Version: 6.0.3790
..3959 ready at Wed, 12 Sep 2007 17:05:15 -0400

This is the response I should be seeing...

If I VPN in, using the Cisco client, and run the same command, "telnet 192.168.0.10 25" i get the 220 ***** response as seen above.

Clients on the internal network running "telnet 192.168.0.10 25" see the correct response 220 mail.domain.com and so on.


I'm not sure what to do with this. The biggest issue is that users connecting via POP3 cannot send emails getting unable to relay errors, and i'm guessing this is the issue. If I setup the same exact POP3 account on the server using Outlook Express, I can send emails fine, outside I cannot.

I read a KB article on MS site about turning off the SMTP command filter in the PIX firewall. I cannot find this command anywhere.

Thanks!!

David Lozzi


.

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