The wrong list, the wrong template, the wrong template to the wrong list, etc. - the joys of e-mail marketing.  However, when an error happens, it's best to own up to it with your audience.  This is the best mea culpa e-mail I've seen in a while:

The original e-mail from Dogster, with the subject:  10 Ways to be a Better Cat Owner in 2010. 

The mea culpa e-mail subject line:  Our Apologies

The e-mail:





Tweet