Outgoing mail server rejects mail

Hello,
My ISP's SMTP server started rejecting the outgoing mail I am trying to send through it. I called them, but they checked the settings with me (which as far as I know had not changed). They said they were OK and that I should call Apple.
Does anyone know what would cause this I restarted the computer and the modem/network completely. It still does it. I have a pc on the same network which is able to send mail through the same SMPT server, so it does seem like something on this mac maybe. Any suggestions?
Thanks
Bob

Start here:
Mail: Troubleshooting sending & receiving email messages

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Enter your password again or cancel.
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I have Mail set to automatically check email every 5
minutes from an SBC-Yahoo DSL line.
*Every day* when I come home, the "Server rejected
the password" error dialog is waiting for me. Of
course, the password is correct. When I re-enter it,
Mail downloads the mail correctly.
This problem seems to occur more often since I
switched over from the old prodigy.net to the
sbc.yahoo.com servers.
While I sure wished that Mail was not totally
boneheaded in handling the occasional failed POP
connection attempt, I wonder whether:
1. I am the only one having this problem
2. It's a Yahoo problem
3. Is there a way to fix it?
TIA
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Before:
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After:
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OS X Mail: Troubleshooting sending and receiving email messages
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Hi all,
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comicstripper1 wrote:
I desperately don't want to upgrade to lion as I run lots of expensive software off my machine, (photoshop, illustrator, indesign, after effects etc) and don't want lion to mess them up. ...
You can continue to run most PowerPC software in Mt. Lion by installing Snow Leopard Server into Parallels 8:
[click on image to enlarge]
Apple is now selling Snow Leopard Server for $19.99 + sales tax & shipping costs at 1.800.MYAPPLE (1.800.692.7753) - Apple Part Number: MC588Z/A (telephone orders only).

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Hi
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Outgoing mail server rejects mail

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