H_CHECK Header Flag (V5 and Later)
If a header definition in the configuration file
begins with a ?flags? conditional, this flag
is set for that header. It tells
sendmail to insert this
header only if one of its ?flags? corresponds to one of
the delivery agent’s F= flags (?flags? in Header Definitions on page 1126). This flag must never be specified
in conf.c—it is set
automatically when sendmail
reads H lines
with ?flags? header flags.
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