email not sent in Outllook;domain isn't in my list of allowed rcpthosts

I've got the following type of error messages several times before with different but valid email addresses.
Any ideas?  Thanks.

"
Your message did not reach some or all of the intended recipients.

      Subject:      Hey
      Sent:      10/31/2003 9:36 PM

The following recipient(s) could not be reached:

      'Foo Bar (fbar@optonline.net)' on 10/31/2003 9:36 PM
            553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
"
josh1111012098Asked:
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CrazyOneCommented:
http://www.snoozeuk.karoo.net/help/email_553.html

This error occurs when you use multiple Dial-Up-Accounts and you try to send an email using one ISP but are connected to the internet via a different ISP.
All that needs to be done is disconnect from the current ISP and dial up with the ISP that corresponds with the email address you are sending from
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CrazyOneCommented:
http://www.mailtraq.de/eu-fr/KB01120806.html
What is the error [553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)]?
What is error "[553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)]"?

This is a typical error returned by a mail server when it is not prepared to act as a relay. Usually, it is because the mail server has been misconfigured and is published as the designated mail relay for the recipient in the message.

You should contact the mail server administrators to report the error, or try again later.

If you are receiving this message for all outgoing mail, then it is probably being reported by your smart host, and this is probably because you are not authorised to use that smart host. This frequently happens when you have multiple dial-in connections but are using the same smart host for all of them.
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CrazyOneCommented:
http://searchwin2000.techtarget.com/ateQuestionNResponse/0,289625,sid1_cid527952_tax285117,00.html
I have five desktops with XP Pro (with 10 users on each machine), 15 laptops with Win98 and one server with SBS 2000.
Everyone has one internal e-mail account, like user@company.local, and an external, like user@company.com. Exchange doesn't relay POP or SMTP because users need to access mail from several places, so they only collect mail from time to time.

The problem is that one single user on one single machine receives the following error every time he tries to send e-mail from Outlook XP using the external e-mail account: "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"

What can I do?
 
This question posed on 16 April 2003  

 I may be wrong, but I am pretty sure that error is coming from a Qmail system. Even if it's not Qmail, it's definitely not an Exchange (or for that matter Small Business Server) error message. You'll need to contact the intended recipient of the message. It is their mail system (again, likely running Qmail) that is rejecting the message.

Feedback from original questioner:

Hi, Scott. There is an important detail that I didn't make quite clear: This user that has a problem sending e-mail can send messages successfully using any other PC, to the same recipients. As a matter of fact, when the problem occurs the message is rejected by the server (SBS on the company). I can't figure out why does it happens only with THAT user on THAT machine. Thanks for your help.


Scott's response:

The reason it only happens for that user on that machine is likely because that one machine is misconfigured. It sounds like it is set to use some other account settings and isn't sending the e-mail to the proper SMTP server. I would double-check the e-mail account settings on this system against one of the working systems. I would be very surprised if they were both configured identically. If they are, you might consider deleting and creating a new mail profile for this user on the non-working machine.
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josh1111012098Author Commented:
I don't have Exchange, and only one cable broadband connection.
I tried later and now it's working.  I've notified the admin of the recipient's server.
Thanks
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CrazyOneCommented:
Glad it got resolved. :)
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