Hi,
I noticed that whenever a message is coming in from courier itself, the $SENDER is empty in maildrop.
Are there any other cases the $SENDER will be empty?
Of course. $SENDER is set to empty for delivery status notifications. Delivery status notifications may originate from any mail server.
I'm hoping smtp requires a MAIL FROM envelope for all external connections, which would mean that the $SENDER should never be empty?
That's not correct.
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