>Or, can "From " have a continuation line? If so, maybe just replace >the "Return-Path:" text with "From ", therefore treating it the same as >"X-Envelope-From:"?
There is, AFAICT, not a true standard when it comes to the mbox format delimiter line; it's not an RFC-822 header. I would not count on support for a continuation line across all MUAs. --Ken
