Gmail adds in sole unsubscribe feature in message details. So, there are two ways to have Gmail notify a sender about a recipient's request - one via the message details (pic below) and the other via marking it as spam and getting the unsubscribe option.
It's been spreading around the net like wildfire, but the rumors were finally put to rest this afternoon when Gmail itself officially announced it's usage of the unsubscribe feature within their web client. For senders, this requires DKIM and/or SPF authentication, a good reputation (as decided by Gmail) and a List-Unsubscribe: header in the form of an email address.
What I'm dying to see is this in action.
I haven't been able to reproduce this myself (after trying with a bunch of senders in my Gmail account) and would love to hear back from anyone who has.
Full post from the horse's mouth here.
Chris Wheeler
Director of Deliverability, Bronto Software




Saw this on CircuitCity's emails. As a sender, it really makes you ask why your emails are not showing the unsubscribe link... Could be related to many things: Volume to Gmail, reputation, incorrect unsubscribe header.
Posted by: Bret | July 24, 2009 at 11:54 AM
I heard that it was only in place for PayPal and eBay at this point
Posted by: John Bollinger | July 24, 2009 at 12:23 PM
Get it to work this evening.
seems gmail have only decided to implement the "mailto" feature in the list-unsubscribe.
too bad, we have decided to use the url method with hotmail (witch have some "problems" with the mailto)
chris you can contact me if you want some help or a demo
Posted by: wilfried | July 24, 2009 at 01:43 PM
I have two gmail accounts and only want one; do I delete both, which I cannot figure out how to do or what. Help page and steps suggested didn't work; so now what do I do?
Posted by: Maureen | July 27, 2009 at 01:39 PM
Woo-hoo! Finally saw this in action with a CircuitCity email! Thanks for the tip, Bret!
Posted by: Chris Wheeler | July 27, 2009 at 10:16 PM