[from Godaddy]
"Our support staff has responded to your request, details of which are described below:
Discussion Notes
Support Staff Response
Dear Jim,
I have reviewed this issue with the appropriate department. We are aware of the issue you've indicated but this is not an issue with our servers at this time. You would need to contact support for the client or the operating system. I apologize for any inconvenience in regards to this matter.
Please let us know if we can assist you in any other way.
Regards,
Felicia B.
Online Support Team
Customer Inquiry [what I sent to GoDaddy]
I recently had a problem [Incident ID: 5485731] that we fundamentally
did not resolve. You might be interested to learn about this thread
on Apple's support board (anyone can read, but you have to login to
post).
http://discussions.apple.com/thread.jspa?messageID=8946645#8946645
Basically dozens and dozens of people are saying that Godaddy's smtp
servers have an issue, exactly the issue I have been seeing. I think
this needs to be escalated beyond the normal, "this guy has a problem"
level. I only say this because I've had a great experience with
Godaddy support for web hosting but this is a technical, nagging
problem for a lot of people and the word is starting to get around....
cheers,
Jim