Document information

Document ID:4661
Subject:User tracking filter
Creation date:12/14/15 4:35 PM
Last modified on:8/13/18 4:08 PM


User tracking filter

Problem

Some of the emails getting blocked have the following reason:

Email is referring to www.xyz.com, which contains user tracking information.

Explanation

Consider the following raw source code of a sample email.

Subject: Re: Your message
To: scott@xyzDomain.com
From: Greg Brown <greg@acme.com>
Date: Tue, 29 May 2012 09:05:33 -0400
Content-type: text/html; CHARSET=US-ASCII

<html>
<body>
Scott,

<img src="http://www.syasdf.com/tracker?u=scott@xyzDomain.com">Hello</a>

</body>
</html>


This sample message contains a URL that has the user's email address. The sender will know if the recipient clicks the link, which serves as an acknowledgment and a validation of the email address. This mechanism is used by many spammers to find out if their spamming campaign is a success.

The URL User detector custom rule detects such messages and assigns a score. If you have messages going in the wrong category, try adjusting the score for this filter. Click Filter Management > Content Filters > Custom Filters to access this filter.



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