FF

F=F

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Need From: in header

All versions

The F=F delivery agent flag is used by sendmail.cf header commands to force the inclusion of sender (" From ") information (F=):

 H?F?Re-sent-From: $q H?F?From: $q 

The F=F delivery agent flag has no special internal meaning to sendmail . It is a convention that is used only in the assorted " From :" header definitions (From:). See F= for a general description of this process.