One of our Users is having a strange issue, before explaining the issue I should clarify that our user Exchange server is collecting mail using a POP3 connector. (not sure if it's relevant)
The user having the issue can receive all external. However 2 accounts are unable to send to her. If I send a message from one of these accounts and cc a working account then only the working account receives the message and only if it's fwd'd to the user does it come in. As I said above it's a POP3 setup, so I tried created a forwarder and tested that in the same way and the result was the same.
I've tried removing her local user profile, reintsalling Outlook, setting account up on another user account. All had the same result.
Any ideas where to go from here?