It already sets those:

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> On Apr 27, 2017, at 10:43 AM, Eric Evans <john.eric.ev...@gmail.com> wrote:
> 
> On Wed, Apr 26, 2017 at 11:16 AM, Jake Luciani <jak...@gmail.com> wrote:
>> Another option would be to add a unsubscribe header, not sure if we already
>> do but I think that causes gmail/outlook to add a unsubscribe button
>> 
>> http://www.list-unsubscribe.com/
> 
> Brilliant.  Sad that it would come to this, but brilliant.
> 
> -- 
> Eric Evans
> john.eric.ev...@gmail.com
> 
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