Engineer, ok. Whew. Didn't retire it just yet.
Here's why I ask:
<< If this address is no longer current/valid, you may "retire" its blocks into another email address.
Before you can do this, you should update all of your clients to your new email address and wait for that new address to appear in the stats database. Once you've done that, you may then retire this email address permanently. >>
It's the first sentence in the second paragraph that scares me..