Can't send mail to .Mac accounts

I saw this problem posted before but the answer didn't solve it for me. I don't have a .Mac account but I use pop mail for my email from my web-based email. Every time I send to a [email protected] address, I get the following message from "Mail Delivery Subsystem" (charles is an example @mac.com address)
The original message was received at Thu, 6 Sep 2007 09:46:33 -0700 (PDT)
from smtpout09-04.prod.mesa1.secureserver.net [64.202.165.17]
----- The following addresses had permanent fatal errors -----
<[email protected]>
(reason: 550 5.1.1 unknown or illegal alias: [email protected])
(expanded from: <[email protected]>)
----- Transcript of session follows -----
... while talking to smtp-bounce.mac.com.:
DATA
<<< 550 5.1.1 unknown or illegal alias: [email protected]
550 5.1.1 <[email protected]>... User unknown
<<< 554 5.5.0 No recipients have been specified.
Reporting-MTA: dns; mac.com
Received-From-MTA: DNS; smtpout09-04.prod.mesa1.secureserver.net
Arrival-Date: Thu, 6 Sep 2007 09:46:33 -0700 (PDT)
Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.1.1
Remote-MTA: DNS; smtp-bounce.mac.com
Diagnostic-Code: SMTP; 550 5.1.1 unknown or illegal alias: [email protected]
Last-Attempt-Date: Thu, 6 Sep 2007 09:46:35 -0700 (PDT)

This is only a guess, as there is no host "smtp-bounce.mac.com": your mailserver smtpout09-04.prod.mesa1.secureserver.net is currently listed at least at one blacklist service (take a look here http://tqmcube.com/cgi-bin/rbltqm?ip=64.202.165.17 to verify) as a spammer.
I am not sure about the technology Apple uses to prevent SPAM, but it technically would be possible to check for listed servers before establishing a connection and saying "HELO" with a faked hostname (smtp-bounce.mac.com in that case) and bouncing all mail.
The second possibility is, of course, that the given error "User unknown" is correct, and the user imply does not exist.
Try figuring this out by sending mail to .Mac users using an alternative mail provider or SMTP-server.

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Suddenly all of my accounts can´t send mail...
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And if I change the outgoing mail server settings in preferences it does not change in the pop up.
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Gunz,
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Found this after searching these discussions for over an hour, and it really works, but you MUST create a new account, don't edit your existing one. Very quick & easy!!! Here you go, courtesy of Guillermo Toro-Lira:
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Can't send mail to .Mac accounts

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