Handle unsubscribe notification via email
requested to merge pchojnacki-gitlab/gitlab-ce:22619-add-an-email-address-to-unsubscribe-list-header-in-email into master
What does this MR do?
Adds an email address to the List-Unsubscribe header to support clients only handling email based unsubscription.
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CHANGELOG entry added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master(if you do - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
Closes #22619 (closed)