Outlook 2k Error - 0x800CCC79

I am still baffled by this whole relay blocking mess. I can't understand why some messages will go out and others rejected. Here's the error:

"The message could not be sent because one of the receipients was rejected by the server. Server Response: '550 5.7.1' Unable to relay for Catherine.Allison-Stubee@HCAHealthcare.com'. (Account: 'mail.interplanhealth.com', SMTP Server: 'mail.interplanhealth.com', Error Number 0x800CCC79)."

The user getting the error above has DSL service with AOL and has her Outlook 2000 client configured for internet only mail with POP3 mail to our company. She can send and receive other messages (even outside of our company) but cannot seem to send mail to this address and occasionally a few others. I have read Microsoft's KB article:

http://support.microsoft.com/default.aspx?scid=kb;en-us;290842

That article assited me with some of our other home office users. I wound up having to use their local ISP's SMTP server with our incoming server and that worked fine. But in those instances, the other users could recieve mail, but were unable to send mail at all. This particular user IS able to send mail, but gets this message occasionally when sending to various other addresses. What gives? I don't know where the error is coming from. Is our server denying the relay or is this AOL? Frankly, I'd rather not have to call the AOL tech support as most times, they haven't been useful. I have another home office user that uses AOL's dial up service and does not have this problem.

I'm at a loss here. Anyone have any suggestions? Thanks in advance!

-Mandy
ablackAsked:
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slink9Commented:
I have experienced a similar problem.  It seemed to be that I received the email on an older ISP account that I still had around just for checking.  If I replied or forwarded it used that account and I got relay messages.  After I deleted that account it used the correct account (the only one) and sent fine.
I also got a similar message here at work.  I changed the SMTP setting to the correct server and that problem went away.
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slink9Commented:
I disagree.  I had the exact same problem in two cases and the fix was to change the SMTP.
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rontokyoCommented:
Can someone please explain how or in what way the SMTP is to be changed. Thank you.
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slink9Commented:
I am sure someone will if you open a new question in the Outlook area.
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