From: Tom Hughes <tom@compton.nu>
Date: Thu, 2 Jan 2020 18:47:14 +0000 (+0000)
Subject: Set X-Entity-Ref-ID header on notification emails
X-Git-Tag: live~3173
X-Git-Url: https://git.openstreetmap.org./rails.git/commitdiff_plain/6c22bf4b9afb26af56430ec9f9e191502fb0ee60?hp=6c22bf4b9afb26af56430ec9f9e191502fb0ee60

Set X-Entity-Ref-ID header on notification emails

This disables threading in gmail completely - without it all
notifications of a given type are grouped together.
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