How to Start an Email Conversation

A few months ago I wrote a post on how to start a conversation the right (It's all about the conversation...or is it?: How to start off an email conversation...the right way) . And with this post I gave some tips on sign up

I was sent this fantastic piece of work that shows the benefits of asking people to confirm their email address in the subject line of the confirmation email. ( see it here )

Definitely worth an A/B Test don't you think ?