Originally Posted by ScottC
This error is most likely coming from your ISP. Which ISP are you using for the outgoing email server?
For outgoing mail it is Earthlink and the setting I am using is the one that is supposed to work for places like this: smptauth.earthlink.net. (My incoming server is the University of California.) When I had a Dell laptop I was using the same setting and it worked for outgoing mail.