Mail Protection: SMTP, POP3, Antispam and Antivirus UTM 9.701: Outgoing mail when using multiple external interfaces and addresses

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UTM 9.701: Outgoing mail when using multiple external interfaces and addresses

GernotMeyer over 4 years ago

Hi,

we have a SG330 with 4 external WAN Interfaces. 2 Interfaces have 4 IPs configured.

To prevent us to setup all IPs in Internet DNS (MX): How can I reduce SMTP traffic to only one interface/one IP?

Mailserver uses Sophos as proxy for outgoing mail.

No button for that in Email protection.

Any hints?

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0 papa_ over 4 years ago

Interfaces / Multipath rules

We need this because only one of our WAN IPs has a DNS MX record
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0 papa_ over 4 years ago

Interfaces / Multipath rules

We need this because only one of our WAN IPs has a DNS MX record
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0 GernotMeyer over 4 years ago in reply to papa_

Yes. Thanks.
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0 GernotMeyer over 4 years ago in reply to papa_

But again some detailed question: It seems that it is not possible to choose an IP different to the IP bound to the interface itself?

So an additionally bound IP to an interface is not choosable. Right?
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0 papa_ over 4 years ago in reply to GernotMeyer

If you don't want the primary but an alternative source IP for outgoing connections, the masquerading rule is not enough. You need a special SNAT rule for the connections
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