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/usr/include/postfix/smtp_reply_footer.h is in postfix-dev 2.11.0-1.

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#ifndef _SMTP_REPLY_FOOTER_H_INCLUDED_
#define _SMTP_REPLY_FOOTER_H_INCLUDED_

/*++
/* NAME
/*	smtp_reply_footer 3h
/* SUMMARY
/*	SMTP reply footer text support
/* SYNOPSIS
/*	#include <smtp_reply_footer.h>
/* DESCRIPTION
/* .nf

 /*
  * Utility library.
  */
#include <vstring.h>
#include <mac_expand.h>

 /*
  * External interface.
  */
extern int smtp_reply_footer(VSTRING *, ssize_t, char *, const char *,
			             MAC_EXP_LOOKUP_FN, char *);

/* LICENSE
/* .ad
/* .fi
/*	The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*--*/

#endif