Client unable to send mail

[larrystupe]

I have a client computer that has trouble sending email to a few recipients. I have already checked the recipient's side for mail blocking. He recieves the 'mail cannot be delivered' message, but the message sometimes does get through. It seems to be on the server side. What would cause one client's email to act this way? And what can I do to try and remedy it?

 

[joepc]

Are you entering in the address the same everytime? Are you the using the address book one time, then using the autofill another? Manually typeing it in?

Are you running exchange or just pop and smtp? If smtp maybe try to find a different smtp server.