Log email delivery failures
What does this MR do and why?
Logs email delivery failure events from Mailgun so we can have a better idea of the numbers and when to act on these failures.
Related to #359116 (closed)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Heinrich Lee Yu