blocking SMTP traffic to gmail etc.

Unanswered Question
Oct 9th, 2008

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.

I have this problem too.
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Collin Clark Thu, 10/09/2008 - 12:41

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?

oddmyth_sohovfx Thu, 10/09/2008 - 12:49

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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