H_BINDLATE Header Flag (V8.10 and Later)
Ordinarily, header fields that contain
sendmail macros have those
macros expanded (their values inserted) when the
header is first processed. Some headers, such as the
Return-Path
:
header, should not have
sendmail macros in their
field expanded until just before final delivery.
Such headers can have the initial macro expansion
skipped by specifying this H_BINDLATE header
flag.
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