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How do I disable ESMTP Inspection on CISCO ASA through Cisco Web Interface?
This is solution applies to firmware version 8.0 + on a CISCO ASA
When trying to telnet outbound from a Barracuda and ESMTP Inspection is turned on in a CISCO ASA you receive a banner that looks like this:
To fix this have the customer go to the Web Interface of their CISCO ASA.
From the web interface go to Configuration > Firewall > Service Policy Rules. From there choose the Rule Actions Tab > Protocol Inspections. In there you will see ESMTP with a checkbox next to it. Unselect the ESMTP checkbox and save changes. ESMTP Inspection should now be turned off and the 220 banner will have the name of the mail server.
Link to this page: