RE: Trouble sending mail to one domain

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Hi Jeff,

Thanks for posting here! Lanwench, GREAT INFO!

I agree with Lanwench that the issue is much possibly caused by the Cisco
PIX firewall device installed in remote domain. The PIX firewall has the
Mailguard feature turned on and the Auth and Auth login commands (Extended
Simple Mail Transfer Protocol [ESMTP] commands) are stripped by the
firewall, and this makes the system think that you are relaying from a
non-local domain.

To determine whether Mailguard is running on your Cisco PIX firewall,
Telnet to the IP address of the MX record, and then verify whether the
response looks similar to the following:
220*******************************************************0*2******0********
***************
2002*******2***0*00


To resolve this issue, contact the administrator in remote domain to turn
off the Mailguard feature of the PIX firewall.

For more information about the information above, please have a look at the
following articles.

320027 XCON: Cannot Send or Receive E-Mail Messages Behind a Cisco PIX
Firewall
http://support.microsoft.com/?id=320027

295164 SMTP Clients Receive Relaying Prohibited Error Message When
http://support.microsoft.com/?id=295164

For more information Cisco PIX Firewall, visit the following Cisco Web
sites:

http://www.cisco.com/warp/public/110/22.html

Hope this helps. If there is anything unclear, feel free to post back.
Thanks and have a nice day!


Lee Li
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security

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