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Mailguard

Created by dave. Last edited by dave, 5 years and 82 days ago. Viewed 3,302 times. #1
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(2013-09-19)

Problem

Can't send or receive some messages through a Cisco ASA firewall.

Solution

Turn off Mailguard on the ASA:

ASA# conf t
ASA(config)# no fixup protocol smtp 25
ASA(config)# exit
ASA# write me
Building configuration...

It may be necessary to reset/reload the ASA after making this change.

Discussion

Dammit, Cisco.

To determine whether Mailguard is running on your Cisco PIX or Cisco ASA 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
Old versions of PIX or ASA:
220 SMTP/cmap_____________________________________ read
For more information, visit the following Cisco Web sites:
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This is a collection of techical information, much of it learned the hard way. Consider it a lab book or a /info directory. I doubt much of it will be of use to anyone else.

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