= Anti-phish 'fake URL' rule idea =

''I have a great idea for an anti-phishing rule, detecting links that claim to be linking to a different URL than their real target!   Will it work?''

Take a look at [[http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4255|bug 4255]] in our Bugzilla -- this idea has been tried in many forms, and mostly unsuccessfully.  A lot of nonspam senders use this, for some reason.

Here are some examples of real-world false positives:

{{{
  <a href="http://www65.americanexpress.com/clicktrk/Tracking?mid=MESSAGEID&msrc=ENG-
ALERTS&url=https://www.americanexpress.com/estatement/?12345">https://
www.americanexpress.com/estatement/?12345</a>

  <A HREF="http://echo.epsilon.com/WebServices/EchoEngine/T.aspx?l=ID">https://www.hilton.com/
en/ww/email/tab_email_subscriptions.jhtml</A>
}}}

If you'd like to comment further, please do so [[http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4255|on bug 4255]].