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

UTM Firewall requires membership for participation - click to join

Thread Info

State Suggested Answer
Locked Locked
Replies 4 replies
Answers 1 answer
Subscribers 3 subscribers
Views 1812 views
Users 0 members are here

Options

Suggested

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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?

This thread was automatically locked due to age.

0 papa_ over 4 years ago

Interfaces / Multipath rules

We need this because only one of our WAN IPs has a DNS MX record
Cancel
Vote Up 0 Vote Down

Cancel
0 GernotMeyer over 4 years ago in reply to papa_

Yes. Thanks.
Cancel
Vote Up 0 Vote Down

Cancel
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?
Cancel
Vote Up 0 Vote Down

Cancel
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
Cancel
Vote Up 0 Vote Down

Cancel