g1smd - 3:58 pm on Oct 2, 2011 (gmt 0)
It's even better when the email has been forwarded a few times:
There is one thing you can design in to the URL structure to help alleviate the problem.
Use http://www.example.com/142892-blue-widgets-green-widgets-sexy-widgets with a record number at the beginning of the path, and where the PHP script checks the slug text is correct for the given ID and then issues a redirect to the correct URL if it is not.
This allows a visitor using any truncated URL, perhaps like http://www.example.com/142892-blue-widgets-gre to still see the content, but crucially, to see it at the correct URL.