#5.7.1 smtp;550 5.7.1 Relaying denied

Why would I receive this realy denied, when I am the one sending the message, I do have relay permissions
because I am an authenticated user in the domain. There seems to be just two people I really need to email
that cannot receive my mail sporadically....Any help would greatly be appreciated...



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

      Subject:      Lowes attachment number 2
      Sent:      7/19/2006 3:31 PM

The following recipient(s) could not be reached:

     someone@server.com on 7/19/2006 3:32 PM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <MYSERVERNAME.COM #5.7.1 smtp;550 5.7.1 <someone@server.com>... Relaying denied>
ittechie100Asked:
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SembeeConnect With a Mentor Commented:
If you are sending through the Outlook client, but this is the only domain that you have problems with, then it has to be an issue with the remote domain. They are blocking your emails in such a way that triggers the cannot relay message.

Single domain issues I don't find worth the hassle, as they will usually say that there is nothing wrong.
Instead, simply configure an SMTP Connector to route email for that domain through your ISP.
http://www.amset.info/exchange/smtp-connector.asp

Simon.
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ittechie100Author Commented:
I got the above error when trying to send an attachment. Plain text goes right through ???
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SembeeCommented:
Are you sending from Outlook or an SMTP client?
What does message tracking say?

Simon.
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ittechie100Author Commented:
Can send to any other domain fine it seems... ???
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ittechie100Author Commented:
Sending through Outlook client.
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ittechie100Author Commented:
         <MyExchangeserver.COM #5.5.0 smtp;550-MYIP  blocked by ldap:ou=rblmx,dc=comcast,dc=net>

What would cause this error ? I haven't seen it before.
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SembeeCommented:
That is comcast's own blacklist. You can speak to them about getting off their list.

Simon.
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