Document information

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



Add a comment to this document

Do you have a helpful tip related to this document that you'd like to share with other users? Please add it below. Your name and tip will appear at the end of the document text.
Your name:
Your email:
Hide my email address
Verification code:
Enter the verification code you see above more submitting your tip
Tip:Please limit tips to 1000 characters