I've installed Zimbra ZCS on a Ubuntu 8.04 server in my house in lombard. I have residential DSL service, so ATT blocks port 25. I have my DNS and domain registration through No-IP.com, and I'm trying to get alternate-port smtp working. I'm at my wits end. I've done this:

Outgoing SMTP Authentication - Zimbra :: Wiki

and no luck. I'm been playing around for this on/off for the last few weeks and I'm just sick of it. If someone could just point me in the right direction/offer some suggestions that would be great. I can provide any information you may need. Thanks!