GMAIL UNSUBSCRIBE and the HOTMAIL GOTCHA http://bit.ly/gmailunsub
Last week, GMAIL released a new feature called GMAIL Unsubscribe. It’s a new setting in GMAIL that will help your email sending reputation. Here’s why. Previously, some GMAIL accounts would click on “report spam” instead of clicking on the unsubscribe link in your newsletter -bad news for your email reputation. Now, when coded correctly, GMAIL provides new options to make it easier for accounts to unsubscribe from your newsletter.

However there are some preconditions for this to work, so it’s not for everybody and not for every email platform.
1 Ideally you should have SPF setup to verify that the sending IP is authenticated to send email using your domain. GMAIL always checks SPF.
2 You have a good email sending reputation
3 Your email platform must be capable of sending signed emails using DKIM (Domain Keys).
4 Your email must be correctly coded to GMAIL’s LIST-UNSUBSCRIBE specification.

HOTMAIL has had a similar feature since 2006 and this is the problem. In Hotmail, the LIST-UNSUBCRIBE format must be a link which will opt out the contact; GMAIL requires MAILTO to be specified inside the LIST-UNSUBSCRIBE. So your email platform will need to cater for the different unsubscribe formats of both.
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Link to this post: http://bit.ly/gmailunsub