Courier-IMAP: change SMTP-Port

[brainkopp]

Hi,

because one of my customer's provider blocks port 25, I want Courier-IMAP to listen also on port 26. Is this possible?

After getting mailserver listen to this port I suggest I must also change the firewall ???

Where can I change this without getting the changes overwritten by plesk ??

THX

EDIT: Sry, i just found this HOWTO http://forum.swsoft.com/showthread.php?s=&threadid=44748

I will try....