Sorry I guess it took the brackets as a tag, here it is again.
How to change qmail smtp port 25 to another port
I believe you can just copy:
/etc/e-smith/templates/etc/services/10standard
to:
/etc/e-smith/templates-custom/etc/services/10standard
then edit the line that says:
smtp 25/tcp mail
to say:
smtp (your port number)/tcp mail
(of course substituting a real number for (your port number))
Just make sure you don't put it on top of another service...