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(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 doesn't do this. But if the emails do have text in the message, it can do it.
I agree with @Andrew - Gmail won't handle this on its own.
However, you could use an intermediary running procmail1, preprocess the mail and add something to the subject, or change its sender, so that it can be filtered secondarily in Gmail.
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