chane email to use port 26 instead of 25

RouterOS Scripting
1

Hay,
how i can let the script ruunung from server using port 26 instead of 25.
Am alrady have a rule
add action=dst-nat chain=dstnat comment=“” disabled=no dst-port=25 protocol=tcp to-ports=26

and its work from clients computer fine.
But all my script from MT not pass and get error

2

you are trying to send email from the same router where dst-nat rules are?

3

yes from same router

4

then it is not going to work because destination nat is in prerouting but packets generated in router never gets there.
Look at this diagram:
http://wiki.mikrotik.com/wiki/Packet_Flow