Penny Post

I'd like to know when an email has a stamp header at all, even if it's to
the weong address. In this case chances are I forgot to place some mail
address in the list of my own mail addresses. As there could be many such
headers, verifying them all seems a waste of resources, but simply
indicating their presence, either through wrpostage.png or through a new
icon, would be nice and should be easy.

Really nifty would be an item "add to my addresses" in the right-cklick
context menu for addresses, so when you subscribe to a new list and receive
the first message over it, there are only two clicks to register it with
pennypost. I'm not sure whether this can be done.