Thank you canopy, unfortunatly it was set correctly.
I have tried adding the accounts again but even though my password is set in mercury to password and all my settings at the end of adding an account read as yours do under the 'Congratulations' screenshot on page 45, I am receiving the same message that the mail server is saying 'username or password incorrect'. Can you think of anything else I can try or is there any more information you need from me?

Thank you, Craig.