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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