need to change email server outgoing ip

RouterOS General
1

So I have listed three IP Public IPs. All of them can be ping-ed just fine.

Ex: 1.1.1.1, 1.1.1.2, 1.1.1.3

Currently all machines including Email Server are using the 1.1.1.1 when going outside.

I want email server to use 1.1.1.2.

add action=src-nat chain=srcnat disabled=no out-interface=internet src-address=192.168.12.30 to-addresses=1.1.1.2

192.168.12.30 is an IP of Email Server.

It doesn’t work and when I check from email server, http://www.whatismyip.com/ shows 1.1.1.1 is still being used by my server.

Need advice on what to check.

IP Firewall Nat

0   chain=srcnat action=src-nat to-addresses=1.1.1.2 
     src-address=192.168.12.30 out-interface=internet

 1   ;;; Masquerade
     chain=srcnat action=masquerade out-interface=internet 


 2   ;;; proxy mikrotik redirect
     chain=dstnat action=redirect to-ports=8080 protocol=tcp 
     src-address=192.168.12.0/24 in-interface=LAN dst-port=3128 

3   chain=dstnat action=redirect to-ports=8080 protocol=tcp 
     src-address=192.168.12.0/24 in-interface=LAN dst-port=80
2

Looks like it should work, please make a printout from:
/ip fire nat print chain=srcnat
and
/ip fire nat print chain=srcnat stats