Custom email: Add support for X-Delivered-To header

Divyam Tayalrequested to merge
gitlab-community/gitlab-org/gitlab:462824-X-Delivered-To into master
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What does this MR do and why?

  • Add header processing to lib/gitlab/email/receiver.rb
  • Add specs to spec/lib/gitlab/email/receiver_spec.rb
  • Add documentation to doc/administration/incoming_email.md

MR acceptance checklist

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Related to #462824 (closed)

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