Allow only smtp traffic from specific subnet to exchange 2003

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    martek
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    #126318

    I have a PIX 515E (6.3) that I want to only allow SMTP traffic to come in from specific subnets,
    I currently allow any SMTP traffic to pass thru to my exchange server.
    access-list outside_access_in permit tcp any host XXX.XXX.XXX.XXX eq smtp
    Everything works fine with this but I need to lock this down.

    The vendor that I use to scan mail has given me 2 subnets that all their outbound SMTP traffic comes from. I added these lines and removed the above line.
    access-list outside_access_in permit tcp host 216.157.255.0 host XXX.XXX.XXX.XXX eq smtp
    access-list outside_access_in permit tcp host 216.157.241.0 host XXX.XXX.XXX.XXX eq smtp
    When these lines are added I can no longer recieve external email. I have confirmed these addresses are correct.

    Any help would be appreciated.

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