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Created by dave. Last edited by dave, 5 years and 82 days ago. Viewed 3,302 times. #1
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Can't send or receive some messages through a Cisco ASA firewall.


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.


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:

Old versions of PIX or ASA:
220 SMTP/cmap_____________________________________ read
For more information, visit the following Cisco Web sites:
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