I was working with Lesson 1 of the Hands on Lab 301, Advanced WSE 3.0
Messaging. This lesson describes how to implement an soap smtp
transport for messaging. It advises you to use your smtp and pop
servers. It works.

But be careful. When the soap smtp service reads your pop account, it
deletes all your emails. Use an account that does not have important
emails in it. Otherwise, you will not be pleased with the results,
unless you don't mind all your emails getting deleted.

Or you can modify the soap smtp library so that it will leave a copy
of your email on the server after it reads it. None of this is
documented in the documentation.