wordpress archive page appended with email address

Hello: After making significant content changes to my website I’ve had to create a number of redirects after removing some content. I’ve been using Google webmaster tools to monitor and further clean things up. I’ve been able to remove all errant pages from GWT except one; which has me baffled.

Namely, GWT shows a 404 error for a number of archive pages that are appended with our business email address. For example:

http://iaddicshelters.net/mt/2011/08/info@iaddicshelters.com

In my browser I can remove the email address and see the archived page. I review the source (using chrome) and used the wordpress editor in an attempt to find the source of the appending/offending email address.

Does anyone have any idea where this appending might be coming from or where to begin looking for a solution.

Thanks, Rich