HOW to let outgoing smtp traffic through a specific ip?

Question

SMTP

There are mikrotik
on eth1 5 white addresses for example (10.0.0.26-10.0.0.30)
behind the local bridge mail server 172.16.0.200
How do I release smtp packets through a specific ip (for example 10.0.0.28)?

Answer 1

/ip firewall nat
add action=src-nat chain=srcnat dst-port=25 out-interface=ether1 protocol=tcp src-address=172.16.0.200 to-addresses=10.0.0.28
this NAT rule must be above the masquerade rule. change the value of dst-port= to yours