Diagnostic-code: smtp; 554 5.7.1 Forbidden for policy reasons

One of our customers called me saying that after he send us an email, he got it back with the following error message.

Diagnostic-code: smtp; 554 5.7.1 Forbidden for policy reasons

We are running exchange server 2003 and we download our emails using a pop3 connector for exchange servers.

What could be causing this message?

Thanks
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AJKBOCAsked:
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AJKBOCConnect With a Mentor Author Commented:
We are currently moving to Jave Communicator Suite. Therefore we will not waste more time on this problem. The problem stays for now.

Thanks all for your comments.

AJKBOC
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calliemanCommented:
First determine the source.

Wich site has genrated the NDR? Look in the original Non Delevry Report message.

Callieman
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AJKBOCAuthor Commented:
This error message was generated by our exchange server.
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SembeeCommented:
What else do you have on the server? AV, Antispam?

That is not an Exchange message, so it has been generated by something else.

Any reason you are still using the POP3 connector? That is not designed for long term use and if you have a permanent connection to the internet you should look to switch to SMTP delivery.

Simon.
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AJKBOCAuthor Commented:
I have NOD32 antivirus for the files, Trent Micro Scanmail for the exchange server and Blackice server protection for firewall.

We are working on removing the pop3 connector as soon as we setup our clustering and redundant internet connections.
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SembeeCommented:
I would be looking to dump the POP3 connector whether or not you had those requirements. POP3 connectors are awful things, requiring the downloading of email before you can block it.

You have to look at the Trend software as the cause of the error. As I said, it isn't an Exchange message.

Simon.
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AJKBOCAuthor Commented:
Attachment Blocking and Content Filtering are disabled. Antispam is enabled, but users still receive the spam emails in the spam folder. Phishing is enabled but again users receive phishing emails tagged as phishing. Spyware is also enabled but the email was sent from our ISP and it was plain text, so it can't be that.

Any more ideas? Maybe something more specific?
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SembeeCommented:
I have never used the Trend software, so cannot comment on whether it could be something in that application. My standard practise when something is being blocked and there is AV or antispam in the way is to recommend that they are removed - it is the only way to ensure that they are not the cause of the problem.

Simon.
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