I'm trying to block the ESMTP EHLO AUTH response message on an ASA version 9.4(4)16 from coming to the client from the server. The application does not support disabling authentication if the server indicates it is supported, but the server is not managed not by us. Here's what I have:
access-list test-smtp-acl extended permit tcp host 10.200.242.165 host 172.20.119.159
match access-list test-smtp-acl
policy-map type inspect esmtp block-auth
allow-tls action log
match ehlo-reply-parameter auth
inspect esmtp block-auth
I know it's matching, because if I turn on "mask-banner" it shows the typical *** instead of the SMTP server name. However, it is allowing the AUTH command through:
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