tree 35a363c78c4e6480f6cf69f1b7772517a00e6e86
parent 62976ad8604586ce420f8472e3cdf7aadf0501b2
author David Pursehouse <dpursehouse@collab.net> 1559705605 +0900
committer David Pursehouse <dpursehouse@collab.net> 1560224629 +0000

NewChangeSender: Set "References" header

GMail has changed the way in which emails are threaded in "conversation
view" [1] and now the "References" header must also be set on the first
mail in a thread.

[1] https://gsuiteupdates.googleblog.com/2019/03/threading-changes-in-gmail-conversation-view.html

Bug: Issue 10943
Change-Id: I146a0495994c35697c8dcc97bf8385cca9507510