Message rejected due to content restrictions

Hi guys.

Certain users are reporting problem sending emails to certain accounts/domains. These users get a NDR message as follow:

The following recipient(s) cannot be reached:

      email@externalDomain.com on 10/30/2013 4:11 PM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <OUR_SERVER_NAME.OUR_DOMAIN.COM #5.7.1 smtp;550 5.7.1 Message rejected due to content restrictions>

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Our mail solution is Exchange 2003 SP2, Don't have any Block List service configure or Global Deny list configuration.

Our SCL rating has been default greater than or equal to 8 since forever.

Our AntiSpam Solution is McAfee Email Gateway 7.5 but for outbound emails there is only one rule defined.
That rule add a disclaimer to the emails in plain text and there's a link for our website as www.domain.net

We don't have forefront or another edge solution

I don't really know what could be happening here.

Any help apreciate
Tri_SupportAsked:
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Skyler KincaidConnect With a Mentor Network/Systems EngineerCommented:
Your message is being blocked on the side of whoever you are sending to. You may need to contact them and see why the messages are being blocked?

Are there any consistencies in the messages such as similar wording in the body or subject? or attachments? I really don't think this is anything on your end.

It sounds like your domain is being blocked by whatever service they use. We have seen a lot of domains be blocked by Barracuda even if it is not displayed on the blacklist on mxtoolbox. You could start by contacting them to see what they use as a filter and if they can whitelist you.
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Tri_SupportAuthor Commented:
Thank you @xKincaidx, actually that's what I would like to believe but I'm curious cause the server name in the error, is our server name

<OUR_SERVER_NAME.OUR_DOMAIN.COM #5.7.1

Right now I'm waiting to hear from them, called just minutes ago, lets see what happens.

Thank you
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Skyler KincaidNetwork/Systems EngineerCommented:
What are the authentication settings for your SMTP relay? Do you have it set to authenticated users or computers?
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Tri_SupportAuthor Commented:
After talking with their email admin we could solved the situation.

Regards.
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Tri_SupportAuthor Commented:
For the sake of documentation our SMTP relay settings is set to:

Allow all computers which sucessfully authenticate to relay, regardless of the list above
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Skyler KincaidNetwork/Systems EngineerCommented:
Awesome! That is how it should be set to avoid the same error message internally.

I am sure they added you to the white list correct?
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Tri_SupportAuthor Commented:
They didn't exactly tell me what they did, but I suppose they did that or modified a rule.
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