fix(email): fix case sensitivity in "Action" header retrieval #6663
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This fixes a casing issue in the handling of the Action header while handling bounce notices from mail servers.
Prior to this change, no emails could be flagged as a bounce email because the Upper-Case version of Action was used. This has been lowercases to "action".
An accompanying unit test, tests that a bounce email is properly passed and it's attributes are setup. I have redacted a sample DSN email as much as I thought was necessary but am happy to re-review this fixture.
As all other header access appears to be lowercase, this just appears to be a simple typo.
This fixes: https://forum.osticket.com/d/104433-undelivered-mail-returned-to-sender-processing too
A huge thank you to: Hikari Akimori from the Resonite community for their sanity checks.