After reading the Yahoo! blog post on the new DEA option : http://www.ymailblog.com/blog/2010/05/changes-to-yahoo-mail-options-disposable-email-addresses/

Will this result , on a longterm , in higher bounce rates , hence reputation problems ?
What if Yahoo! users sign up to your service with a DEA address (double opt-in) and after a couple of weeks they decide to dump the DEA address
but they don't change their email preferences in your emailing program ?
Will bounce rates drastically raise with this new feature ?

Pondering thoughts on the Email marketersclub to follow : http://www.emailmarketersclub.com/forum/topics/will-the-yahoo-mail-dea-result