FD

F=D

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Need Date: in header

All versions

The F=D delivery agent flag is used by sendmail.cf header commands to force the inclusion of date information:

 H?D?Re-sent-Date: $a H?D?Date: $a 

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