Resolve "Add X-Forwarded-To to allowed headers for email ingestion"
What does this MR do and why?
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Add header processing to lib/gitlab/email/receiver.rb
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Add specs to spec/lib/gitlab/email/receiver_spec.rb
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Add documentation to doc/administration/incoming_email.md
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Related to #498173 (closed)
Edited by Divyam Tayal