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UTM 2 different ISP's on 2 NIC's but need 1 SMTP NIC

PabloDiablo
Hi All,
I want to use Email Protection for my mailserver.
My UTM has 2 (Public) NIC's. NIC 1 ISP A and NIC 2 ISP B.
ISP A does not allow SMTP traffic so I want to receive mail on NIC 2 (ISP B).
But when I enable Email Protection, both NIC's are able to receive e-mails?!
I will receive an angry e-mail from my ISP A that my port is open, I want to prevent this.

Is it even possible to use Email Protection on 1 NIC (2) and not on both NIC's?

TIA


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  • 0
    Agreed with Bruce and Barry.  'DNAT : Any -> SMTP -> NIC 1 (Address) : to {non-existant IP}'

    You can't do it with a Firewall rule because of what I call Rule #2:

    In general, a packet arriving at an interface is handled only by one of the following, in order:
    DNATs first, then VPNs and Proxies and, finally, manual Routes and Firewall rules.



    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    Agreed with Bruce and Barry.  'DNAT : Any -> SMTP -> NIC 1 (Address) : to {non-existant IP}'

    You can't do it with a Firewall rule because of what I call Rule #2:

    In general, a packet arriving at an interface is handled only by one of the following, in order:
    DNATs first, then VPNs and Proxies and, finally, manual Routes and Firewall rules.



    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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