SMTP relay port specification?

I started this post after much searching and finally stumbled on my answer (I think). But this still leaves a question that I hope some of you can give recommendations to. Under future changes to Eset....
"51. Allow the specification of port for smtp mail notification - for example, mail.eset.com:10025. Include SMTP over SSL (standard port 465) for notifications."

I'm currently need to use smtp relay over port 3535 ... which won't work.

So what's the answer. Does anyone have a simple solution?

Here is what I'm thinking. I have a secure connection to a 'server' that all clients can talk to... is their a good smtp/pop3 application you would recommend? I can then just add this to MS outlook as another server to 'pull' email from. I would need the application to run on Windows xp and server.
I would rather avoid using my ISP email relay (if they don't block it) due to changing ISP's causes work.

NOTE: I believe the above needs to read "mail.eset.com 10025" - no ":" - I could be wrong. I know a command line connection does not use a colon.