10-09-2008 07:49 AM - edited 03-11-2019 06:55 AM
I have a ASA 5510, I am looking to block all SMTP traffic to any domain other than our own (ie. gmail).
How would I go about doing this?
Would I configure an ESMTP inspect map? Or would this be easier to do simply by blocking DNS queries for these sites.
Ideally it would be great to have a wildcard wherein only matches to our domain are accepted and all others blocked.
10-09-2008 12:41 PM
I'm not sure I understand your question. Are you looking to block SMTP outbound from your users? or are you trying to restrict who can send email to you?
10-09-2008 12:49 PM
Sorry, I'll try to be clearer.
I'm trying to block outbound SMTP to any SMTP service except the one provided to us by our ISP.
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