Problems sending a email to external email address

I received the following message when I tried to send an email to some external email accounts.

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

      Subject:      FW: Vote for Darius
      Sent:      5/28/2009 7:54 AM

The following recipient(s) cannot be reached:

      llwfalknor@sbcglobal.net on 5/28/2009 7:57 AM
            The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
            <mail.checkpnt.com #5.3.0 smtp;553 5.3.0 <llwfalknor@sbcglobal.net>... Addressee unknown, relay=[66.55.58.218]>

Xeon07Asked:
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Is exchange sending emails? Or an smtp relay software?
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shadowlesssCommented:
llwfalknor@sbcglobal.net - Addressee unknown

This email does not exist or you have made a type-0
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shadowlesssCommented:
This problem is not due to any configuration on your server but on the receiving server but again...it looks like an invalid email address
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Xeon07Author Commented:
It is exchange sending mails. But now when I send an email a receive the following.
Your message did not reach some or all of the intended recipients.

      Subject:      FW: Vote for Darius
      Sent:      5/28/2009 7:54 AM

The following recipient(s) cannot be reached:

      John@trinity-first.org on 5/28/2009 7:57 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mail.checkpnt.com #5.5.0 smtp;553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)>

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shadowlesssCommented:
Once again..this looks like a problem on the receiving side not yours.
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