[openstreetmap/openstreetmap-website] Add In-Reply-To, References headers to email (#2462)

[mmd]

@mmd-osm pushed 1 commit.

963317e5bba8041b0b20e72116d94d053cf59cae  Rubocup, another one.


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/2462/files/9d841cb78168dcc64df91b9253ef34e137f622ef..963317e5bba8041b0b20e72116d94d053cf59cae
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