OK I hold my hands up - it was my fault. I had not realised I needed to use a different server name for SSL to work. Once I put that info in correctly it worked like a charm. Presumably back when I setup my other apps/programs they must have auto-configured the settings as I've never had to put that info in before.

Anyway it is all good now and I'm pretty impressed with the app so far and look forward to seeing it grow.