How to route all traffic from the mail server through another Mikrotik IP address?

Question

Email

Colleagues, tell me how to send all mail traffic through another IP address?
One provider, several ip.
What I have already done - I marked all the traffic that comes from the mail server to addresses other than the addresses of the local network and sent it through Routes to another IP.
but as before, all traffic flows through another ip, through which users go to the Internet.

Answer 1

You need to properly configure SRCNAT AND DSTNAT. I can’t tell you exactly how to do this on MikroTik, but on pfSense it’s done like this:
1. Set up an additional IP on the interface facing the provider
2. Set up port forwarding (DSTNAT) on this address inside the network (to the mail server)
3. Configures NAT Outbound (SRCNAT) so that the mailer goes online through a dedicated IP
4. Check
Profit