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.
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