USG20 VPN - How can I set up the outbound traffic for mail to use the same IP address?

a4g_inatl1

I am setting up a new mail server. One of the problems I am seeing is the server validates in and outbound traffic, which is good. I have a block of 8 IPs, 5 usable. Example: 12.34.56.57 to 12.34.56.61 usable IP's.

My mail server is configured on 12.34.56.58.

All outbound traffic goes through IP 12.34.56.57. This is causing a problem for my mail server.

Is there a way to bind outbound mail to use 12.34.56.58 instead of 12.34.56.57?

Here is an example of the message: "Cannot match your IP 12.34.56.57 against hostname mail.domain.com (DNS returned 121.34.56.58)"

TIA, Darryl.

PeterUK

Yes make a routeing rule with

incoming LAN

source address 12.34.56.58

nexthop WAN

SNAT none