WIP: Add Exchange Reply by Mail documentation
What does this MR do?
This is a continuation/replacement of gitlab-org/gitlab-ce!1624. It provides documentation on setting up Microsoft's Exchange server to work with the reply by email feature.
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together