Whitelist problem

[InvictaNet Customer Support]

I would be grateful for any assistance with this problem.

We scan email for an Estate Agent. They have forms on numerous 3rd party web
sites for enquirers to send requests for information.The from address will
be different each time.

Is there a simple way I can whitelist the emails? Perhaps there is a way I
can whitelist the server? (asserta.net)

TIA
Martyn Routley
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martyn at support.invictanet.co.uk
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fax: 08707 440181
Ask us about our online Antivirus and Junk mail scanning service
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Sample headers are as follows:

Return-Path: <ENQUIRERS at EMAIL.ADDRESS>
Received: from krusty.dc.asserta.net ([217.204.56.189])
 by lemsip.invictanet.co.uk (8.12.8/8.12.8) with ESMTP id h2LBWIxu041604
 for <sales at OURCUSTOMER.COM>; Fri, 21 Mar 2003 11:32:18 GMT
 (envelope-from ENQUIRERS at EMAIL.ADDRESS)
Received: from gonzo (gonzo [10.1.0.84])
 by krusty.dc.asserta.net (8.11.6+Sun/8.11.6) with ESMTP id h2LBWFC27483
 for <sales at OURCUSTOMER.COM>; Fri, 21 Mar 2003 11:32:15 GMT
Date: Fri, 21 Mar 2003 11:32:15 GMT
Message-ID: <13587361.1048246335881.JavaMail.weblogic at gonzo>
From: ENQUIRERS at EMAIL.ADDRESS
To: sales at OURCUSTOMER.COM
Subject: {Spam?} asserta home request: email agent
Mime-Version: 1.0
Content-Type: multipart/alternative;
 boundary="----=_Part_782_174500.1048246335877"
X-MailScanner-Information: Please contact the ISP for more information
X-MailScanner: Found to be clean
X-MailScanner-SpamCheck: spam, SpamAssassin (score=5.6, required 5,
 MORTGAGE_OBFU, NO_MX_FOR_FROM, NO_REAL_NAME, SPAM_PHRASE_00_01)
X-MailScanner-SpamScore: sssss
X-UIDL: PMj!!<Bl"!"/T!!iS\"!