PIX 520 V6.3.3

I am using a PIX 520 v 6.3.3 and having a spam problem. A spam service Postini is employed. I want to deny all SMTP traffic unless it comes from one of the Postini servers. Can the PIX be configured to accomplish this?

Thanks in advance for any help.
dnicksicAsked:
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lrmooreCommented:
Sure. Assuming that you have an access-list entry similar to this:

access-list outside_access_in permit tcp any host A.B.C.D eq smtp

Change to:
 access-list outside_access_in permit tcp host 1.2.3.4 host A.B.C.D eq smtp
Where: 1.2.3.4 = Postini mail host IP address

Any time you make changes to a PIX access-list, you should re-apply that acl to the interface...

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