Replies to Offbott update emails from iOS's Mail app include some of the replied text.
eg, If I replied with "This is my update." it would appear as something like:
This is my update. > On 27 Nov 2013, at 11:34, offbott.d3753cd0-3985-0131-12a4-32f483bf8933@offbott.com wrote: > > Hi, Phil Gyford! > >
I think it's only from iOS's Mail app. iOS 7, maybe 6 too.