Many users have reported to be getting a long error message saying: Send test e-mail message: The connection to the server was interrupted. If the problem continues ...

You’ve just picked up your iPhone to check an important email, only to be greeted by an annoying pop-up message: “Cannot Verify Server Identity.” If you’ve encountered this error, you’re not alone.

As the topic indicated I can only access my email server within the network. I setup qmail + vpopmail + courier-imap. If I put the ip of the machine in the incoming/outgoing address then all is well.