your able to send out email but unable to received emails, did you check your settings for the incoming mail (assuming your using POP3) and another you might wanna checked with your domain provider about the settings regarding about that settings.
just to give you an idea on what im talking about on the outlook settings
that your trying to figure out
incoming settings would be typically like this:
ex. pop.yourdomain.com port: 110
outgoing settings would be typically like this:
ex. smtp.yourdomain.com port: 25
let me know if this helps you