When an email X is sent from A to B who uses GMail, and B sets filter to auto-forward to C; envelope-address of X will still show A as sender. However, C cannot define mail rule that sender is A!
Reason
As X is coming from Internet (GMail), there will be field "SMTPOriginator". And in this case the fields 'SMTPOriginator' = B and 'From' = A; and 'Sender' in mail rule will check field 'SMTPOriginator' instead: i.e., sender becomes B not A.
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