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ContentProtect - Possible error blocking email

I am getting rejections on "some", but not all emails being sent to internal gunderlin.com email addresses and have reached wits end in trying to figure out the issue.
Outging email is an SMTP server through out ISP, Paetec, and the server address is relay-mail.paetec.net.
Incoming email is POP3 though out web hosting company Cedant, and the server address is mail.gunderlin.com.
An example of the error message that I am receiving follows:

----- Original Message -----
From: Mail Delivery Subsystem
To: djs@gunderlin.com
Sent: Monday, October 13, 2008 10:35 AM
Subject: Returned mail: see transcript for details

The original message was received at Mon, 13 Oct 2008 10:35:27 -0400
from [64.80.60.206]

----- The following addresses had permanent fatal errors -----
<alberto@gunderlin.com>
(reason: 554 5.7.1 Forbidden for policy reasons)
<willie@gunderlin.com>
(reason: 554 5.7.1 Forbidden for policy reasons)
<jay@gunderlin.com>
(reason: 554 5.7.1 Forbidden for policy reasons)
<mark@gunderlin.com>
(reason: 554 5.7.1 Forbidden for policy reasons)
<russ@gunderlin.com>
(reason: 554 5.7.1 Forbidden for policy reasons)

----- Transcript of session follows -----
... while talking to gunderlin.com.:
>>> DATA
<<< 554 5.7.1 Forbidden for policy reasons
554 5.0.0 Service unavailable

--------------------------------------------------------------------------------

Return-Path: <djs@gunderlin.com>
Received: from soup ([64.80.60.206])
by mrelay-01-char.paetec.net (8.14.1/8.14.1) with SMTP id m9DEZMZ9026145;
Mon, 13 Oct 2008 10:35:27 -0400
Message-ID: <BE3A3903B15B4D409C24342D3BFBA4E9@gunderlin.local>
From: "David Szczublewski" <djs@gunderlin.com>
To: "Meehan, Mike" <Mike.Meehan@otis.com>
Cc: "Alberto Menacho" <alberto@gunderlin.com>, <willie@gunderlin.com>,
<jay@gunderlin.com>, "Mark Hersh" <mark@gunderlin.com>,
"Boles, Michael T" <michael.boles@otis.com>,
"Russ Marot" <russ@gunderlin.com>
References: <2C2C2361D581D64888A38179080E50AA01915BD8@husnwe03.na.utcmail.com> <FE65B9C09B044E00B9B2A9F8C3F9DF81@gunderlin.local> <005701c92a22$833c1fa0$4a00000a@gunderlin.local> <2C2C2361D581D64888A38179080E50AA01915F0D@husnwe03.na.utcmail.com> <075801c92a4f$5aff6600$3500000a@gunderlin.local> <2C2C2361D581D64888A38179080E50AA01915F4C@husnwe03.na.utcmail.com> <939A37FE85CA49A98F5F98E9CF8C831D@gunderlin.local> <2C2C2361D581D64888A38179080E50AA019164C7@husnwe03.na.utcmail.com>
Subject: Re: RE: Goldman Sachs / 27613 - Car SE5 (Drawing - Sill Extensions)
Date: Mon, 13 Oct 2008 10:34:38 -0400
Organization: Gunderlin LTD
MIME-Version: 1.0
Content-Type: multipart/related;
boundary="----=_NextPart_000_0078_01C92D1F.4AEF1B70";
type="multipart/alternative"
X-Priority: 1
X-MSMail-Priority: High
X-Mailer: Microsoft Outlook Express 6.00.2900.5512
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579

The attached .dat file follows:

Reporting-MTA: dns; mrelay-01-char.paetec.net
Received-From-MTA: DNS; [64.80.60.206]
Arrival-Date: Mon, 13 Oct 2008 10:35:27 -0400

Final-Recipient: RFC822; alberto@gunderlin.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; gunderlin.com
Diagnostic-Code: SMTP; 554 5.7.1 Forbidden for policy reasons
Last-Attempt-Date: Mon, 13 Oct 2008 10:35:38 -0400

Final-Recipient: RFC822; willie@gunderlin.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; gunderlin.com
Diagnostic-Code: SMTP; 554 5.7.1 Forbidden for policy reasons
Last-Attempt-Date: Mon, 13 Oct 2008 10:35:38 -0400

Final-Recipient: RFC822; jay@gunderlin.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; gunderlin.com
Diagnostic-Code: SMTP; 554 5.7.1 Forbidden for policy reasons
Last-Attempt-Date: Mon, 13 Oct 2008 10:35:38 -0400

Final-Recipient: RFC822; mark@gunderlin.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; gunderlin.com
Diagnostic-Code: SMTP; 554 5.7.1 Forbidden for policy reasons
Last-Attempt-Date: Mon, 13 Oct 2008 10:35:38 -0400

Final-Recipient: RFC822; russ@gunderlin.com
Action: failed
Status: 5.7.1
Remote-MTA: DNS; gunderlin.com
Diagnostic-Code: SMTP; 554 5.7.1 Forbidden for policy reasons
Last-Attempt-Date: Mon, 13 Oct 2008 10:35:38 -0400

Thank-you in advance for any assistance in resolving this issue as to many business emails are being rejected which cuses me to call each person to tell them what needs to be completed.

Soupy

rid

Internal addresses... do you run an in-house mail server at all? Otherwise "internal" mail will be going the same route as incoming external, at least in your end, so to speak; everything is going into your "incoming" server, even if it is "internal". Any filtering rules set up there may have an impact. You may have to talk with the ones that maintain your incoming server.
/RID

soupy28

ASKER

Outging email is an SMTP server through our ISP, Paetec, and the server address is relay-mail.paetec.net.
Incoming email is POP3 though our web hosting company Cedant, and the server address is mail.gunderlin.com.
All incoming and outgoing Internet traffice is filtered through ContentWatch's ContentProtect CP100 Security Appliance.
David

rid

If I get you right, all incoming mail go through the Cedant mail server (POP3 server). The rejections are for "policy reasons" which suggest some sort of SPAM filtering. You will have to talk to whomever is administrator for your incoming server. At least you should have them whitelist your own domain name.
/RID

soupy28

ASKER

I have dispatched an email to Cedant Tech Support, along with the initial message posted here, to see what they have to say about this. Will advise. Thanks for the assistance so far. Soupy

ASKER CERTIFIED SOLUTION

Andreas Gieryic

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soupy28

ASKER

I never considered the "black list" SPAM lists to be a consideration. After contacting our ISP and email host, they completed the proper paperwork to remove our static IP addresses and our domain name from these lists. Most excellent.