(Not a dup: this very similar question really asks about the DeliveredTo header).
Bugzilla provides a number of headers telling you why you received a mail, such as X-Bugzilla-Reason. How can I filter on arbitrary tags such as this one in Gmail?
Gmail – Is it possible to create a Gmail filter that works on arbitrary headers
email-headersgmailgmail-filters
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Best Answer
Gmail doesn't do this. But if the emails do have text in the message, it can do it.