OT: "Read Receipts"

Over at Language Hat, they are trying to establish the common pronunciation of "read receipts" [1] To me, they've always just been "DSNs" or "MDNs", however, according to rfc2298, their history goes back further. Of those who lived that history, and actually heard or said "read receipts", did you pronounce "read" as "reed" or as "red"? Thanks! Patrick [1] http://languagehat.com/read-receipts/