int     bounce_trace_service(int flags, char *service, char *queue_name,
			             char *queue_id, char *encoding,
			             int smtputf8,
			             char *recipient, char *dsn_envid,
			             int unused_dsn_ret,
			             BOUNCE_TEMPLATES *ts)
{
    BOUNCE_INFO *bounce_info;
    int     bounce_status = 1;
    VSTREAM *bounce;
    int     notify_mask = name_mask(VAR_NOTIFY_CLASSES, mail_error_masks,
				    var_notify_classes);
    VSTRING *new_id;
    int     count;
    const char *sender;

    /*
     * For consistency with fail/delay notifications, send notification for a
     * non-bounce message as a single-bounce message, send notification for a
     * single-bounce message as a double-bounce message, and drop requests to
     * send notification for a double-bounce message.
     */
#define NULL_SENDER		MAIL_ADDR_EMPTY	/* special address */

    if (strcasecmp(recipient, mail_addr_double_bounce()) == 0) {
	msg_info("%s: not sending trace/success notification for "
		 "double-bounce message", queue_id);
	return (0);
    } else if (*recipient == 0) {
	if ((notify_mask & MAIL_ERROR_2BOUNCE) != 0) {
	    recipient = var_2bounce_rcpt;
	    sender = mail_addr_double_bounce();
	} else {
	    msg_info("%s: not sending trace/success notification "
		     "for single-bounce message", queue_id);
	    if (mail_queue_remove(service, queue_id) && errno != ENOENT)
		msg_fatal("remove %s %s: %m", service, queue_id);
	    return (0);
	}
    } else {
	/* Always send notification for non-bounce message. */
	sender = NULL_SENDER;
    }

    /*
     * Initialize. Open queue file, bounce log, etc.
     * 
     * XXX DSN The trace service produces information from the trace logfile
     * which is used for three types of reports:
     * 
     * a) "what-if" reports that show what would happen without actually
     * delivering mail (sendmail -bv).
     * 
     * b) A report of actual deliveries (sendmail -v).
     * 
     * c) DSN NOTIFY=SUCCESS reports of successful delivery ("delivered",
     * "expanded" or "relayed").
     */
#define NON_DSN_FLAGS (DEL_REQ_FLAG_USR_VRFY | DEL_REQ_FLAG_RECORD)

    bounce_info = bounce_mail_init(service, queue_name, queue_id,
				   encoding, smtputf8, dsn_envid,
				   flags & NON_DSN_FLAGS ?
				   ts->verify : ts->success);

    /*
     * XXX With multi-recipient mail some queue file recipients may have
     * NOTIFY=SUCCESS and others not. Depending on what subset of recipients
     * are delivered, a trace file may or may not be created. Even when the
     * last partial delivery attempt had no NOTIFY=SUCCESS recipients, a
     * trace file may still exist from a previous partial delivery attempt.
     * So as long as any recipient in the original queue file had
     * NOTIFY=SUCCESS we have to always look for the trace file and be
     * prepared for the file not to exist.
     * 
     * See also comments in qmgr/qmgr_active.c.
     */
    if (bounce_info->log_handle == 0) {
	if (msg_verbose)
	    msg_info("%s: no trace file -- not sending a notification",
		     queue_id);
	bounce_mail_free(bounce_info);
	return (0);
    }
#define NULL_TRACE_FLAGS	0

    /*
     * Send a single bounce with a template message header, some boilerplate
     * text that pretends that we are a polite mail system, the text with
     * per-recipient status, and a copy of the original message.
     * 
     * XXX DSN We use the same trace file for "what-if", "verbose delivery" and
     * "success" delivery reports. This saves file system overhead because
     * there are fewer potential left-over files to remove up when we create
     * a new queue file.
     */
    new_id = vstring_alloc(10);
    if ((bounce = post_mail_fopen_nowait(sender, recipient,
					 MAIL_SRC_MASK_BOUNCE,
					 NULL_TRACE_FLAGS,
					 smtputf8,
					 new_id)) != 0) {
	count = -1;
	if (bounce_header(bounce, bounce_info, recipient,
			  NO_POSTMASTER_COPY) == 0
	    && bounce_boilerplate(bounce, bounce_info) == 0
	    && (count = bounce_diagnostic_log(bounce, bounce_info,
					      DSN_NOTIFY_OVERRIDE)) > 0
	    && bounce_header_dsn(bounce, bounce_info) == 0
	    && bounce_diagnostic_dsn(bounce, bounce_info,
				     DSN_NOTIFY_OVERRIDE) > 0) {
	    bounce_original(bounce, bounce_info, DSN_RET_HDRS);
	    bounce_status = post_mail_fclose(bounce);
	    if (bounce_status == 0)
		msg_info("%s: sender delivery status notification: %s",
			 queue_id, STR(new_id));
	} else {
	    (void) vstream_fclose(bounce);
	    if (count == 0)
		bounce_status = 0;
	}
    }

    /*
     * Examine the completion status. Delete the trace log file only when the
     * status notice was posted successfully.
     */
    if (bounce_status == 0 && mail_queue_remove(service, queue_id)
	&& errno != ENOENT)
	msg_fatal("remove %s %s: %m", service, queue_id);

    /*
     * Cleanup.
     */
    bounce_mail_free(bounce_info);
    vstring_free(new_id);

    return (bounce_status);
}
int     bounce_warn_service(int unused_flags, char *service, char *queue_name,
			            char *queue_id, char *encoding,
			            char *recipient)
{
    BOUNCE_INFO *bounce_info;
    int     bounce_status = 1;
    int     postmaster_status = 1;
    VSTREAM *bounce;
    int     notify_mask = name_mask(VAR_NOTIFY_CLASSES, mail_error_masks,
				    var_notify_classes);
    char   *postmaster;

    /*
     * Initialize. Open queue file, bounce log, etc.
     */
    bounce_info = bounce_mail_init(service, queue_name, queue_id,
				   encoding, BOUNCE_MSG_WARN);

#define NULL_SENDER		MAIL_ADDR_EMPTY	/* special address */
#define NULL_TRACE_FLAGS	0
#define BOUNCE_HEADERS		1

    /*
     * The choice of sender address depends on the recipient address. For a
     * single bounce (a non-delivery notification to the message originator),
     * the sender address is the empty string. For a double bounce (typically
     * a failed single bounce, or a postmaster notification that was produced
     * by any of the mail processes) the sender address is defined by the
     * var_double_bounce_sender configuration variable. When a double bounce
     * cannot be delivered, the queue manager blackholes the resulting triple
     * bounce message.
     */

    /*
     * Double bounce failed. Never send a triple bounce.
     * 
     * However, this does not prevent double bounces from bouncing on other
     * systems. In order to cope with this, either the queue manager must
     * recognize the double-bounce recipient address and discard mail, or
     * every delivery agent must recognize the double-bounce sender address
     * and substitute something else so mail does not come back at us.
     */
    if (strcasecmp(recipient, mail_addr_double_bounce()) == 0) {
	msg_warn("%s: undeliverable postmaster notification discarded",
		 queue_id);
	bounce_status = 0;
    }

    /*
     * Single bounce failed. Optionally send a double bounce to postmaster.
     */
#define ANY_BOUNCE (MAIL_ERROR_2BOUNCE | MAIL_ERROR_BOUNCE)
#define SKIP_IF_DELAY  ((notify_mask & MAIL_ERROR_DELAY) == 0)

    else if (*recipient == 0) {
	if (SKIP_IF_DELAY) {
	    bounce_status = 0;
	} else {
	    postmaster = var_delay_rcpt;
	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
						 postmaster,
						 CLEANUP_FLAG_MASK_INTERNAL,
						 NULL_TRACE_FLAGS)) != 0) {

		/*
		 * Double bounce to Postmaster. This is the last opportunity
		 * for this message to be delivered. Send the text with
		 * reason for the bounce, and the headers of the original
		 * message. Don't bother sending the boiler-plate text.
		 */
		if (!bounce_header(bounce, bounce_info, postmaster)
		    && bounce_diagnostic_log(bounce, bounce_info) == 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_diagnostic_dsn(bounce, bounce_info) == 0)
		    bounce_original(bounce, bounce_info, BOUNCE_HEADERS);
		bounce_status = post_mail_fclose(bounce);
	    }
	}
    }

    /*
     * Non-bounce failed. Send a single bounce.
     */
    else {
	if ((bounce = post_mail_fopen_nowait(NULL_SENDER, recipient,
					     CLEANUP_FLAG_MASK_INTERNAL,
					     NULL_TRACE_FLAGS)) != 0) {

	    /*
	     * Send the bounce message header, some boilerplate text that
	     * pretends that we are a polite mail system, the text with
	     * reason for the bounce, and a copy of the original message.
	     */
	    if (bounce_header(bounce, bounce_info, recipient) == 0
		&& bounce_boilerplate(bounce, bounce_info) == 0
		&& bounce_diagnostic_log(bounce, bounce_info) == 0
		&& bounce_header_dsn(bounce, bounce_info) == 0
		&& bounce_diagnostic_dsn(bounce, bounce_info) == 0)
		bounce_original(bounce, bounce_info, BOUNCE_HEADERS);
	    bounce_status = post_mail_fclose(bounce);
	}

	/*
	 * Optionally, send a postmaster notice.
	 * 
	 * This postmaster notice is not critical, so if it fails don't
	 * retransmit the bounce that we just generated, just log a warning.
	 */
#define WANT_IF_DELAY  ((notify_mask & MAIL_ERROR_DELAY))

	if (bounce_status == 0 && WANT_IF_DELAY
	    && strcasecmp(recipient, mail_addr_double_bounce()) != 0) {

	    /*
	     * Send the text with reason for the bounce, and the headers of
	     * the original message. Don't bother sending the boiler-plate
	     * text. This postmaster notice is not critical, so if it fails
	     * don't retransmit the bounce that we just generated, just log a
	     * warning.
	     */
	    postmaster = var_delay_rcpt;
	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
						 postmaster,
						 CLEANUP_FLAG_MASK_INTERNAL,
						 NULL_TRACE_FLAGS)) != 0) {
		if (bounce_header(bounce, bounce_info, postmaster) == 0
		    && bounce_diagnostic_log(bounce, bounce_info) == 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_diagnostic_dsn(bounce, bounce_info) == 0)
		    bounce_original(bounce, bounce_info, BOUNCE_HEADERS);
		postmaster_status = post_mail_fclose(bounce);
	    }
	    if (postmaster_status)
		msg_warn("postmaster notice failed while bouncing to %s",
			 recipient);
	}
    }

    /*
     * Cleanup.
     */
    bounce_mail_free(bounce_info);

    return (bounce_status);
}
Exemple #3
0
int     bounce_one_service(int flags, char *queue_name, char *queue_id,
			           char *encoding, char *orig_sender,
			           char *dsn_envid, int dsn_ret,
			           RCPT_BUF *rcpt_buf, DSN_BUF *dsn_buf,
			           BOUNCE_TEMPLATES *ts)
{
    BOUNCE_INFO *bounce_info;
    int     bounce_status = 1;
    int     postmaster_status = 1;
    VSTREAM *bounce;
    int     notify_mask = name_mask(VAR_NOTIFY_CLASSES, mail_error_masks,
				    var_notify_classes);
    VSTRING *new_id = vstring_alloc(10);

    /*
     * Initialize. Open queue file, bounce log, etc.
     */
    bounce_info = bounce_mail_one_init(queue_name, queue_id, encoding,
				       dsn_envid, rcpt_buf, dsn_buf,
				       ts->failure);

#define NULL_SENDER		MAIL_ADDR_EMPTY	/* special address */
#define NULL_TRACE_FLAGS	0

    /*
     * The choice of bounce sender address depends on the original sender
     * address. For a single bounce (a non-delivery notification to the
     * message originator), the sender address is the empty string. For a
     * double bounce (typically a failed single bounce, or a postmaster
     * notification that was produced by any of the mail processes) the
     * sender address is defined by the var_double_bounce_sender
     * configuration variable. When a double bounce cannot be delivered, the
     * queue manager blackholes the resulting triple bounce message.
     */

    /*
     * Double bounce failed. Never send a triple bounce.
     * 
     * However, this does not prevent double bounces from bouncing on other
     * systems. In order to cope with this, either the queue manager must
     * recognize the double-bounce original sender address and discard mail,
     * or every delivery agent must recognize the double-bounce sender
     * address and substitute something else so mail does not come back at
     * us.
     */
    if (strcasecmp(orig_sender, mail_addr_double_bounce()) == 0) {
	msg_warn("%s: undeliverable postmaster notification discarded",
		 queue_id);
	bounce_status = 0;
    }

    /*
     * Single bounce failed. Optionally send a double bounce to postmaster,
     * subject to notify_classes restrictions.
     */
#define ANY_BOUNCE (MAIL_ERROR_2BOUNCE | MAIL_ERROR_BOUNCE)
#define SEND_POSTMASTER_ANY_BOUNCE_NOTICE (notify_mask & ANY_BOUNCE)

    else if (*orig_sender == 0) {
	if (!SEND_POSTMASTER_ANY_BOUNCE_NOTICE) {
	    bounce_status = 0;
	} else {
	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
						 var_2bounce_rcpt,
						 INT_FILT_MASK_BOUNCE,
						 NULL_TRACE_FLAGS,
						 new_id)) != 0) {

		/*
		 * Double bounce to Postmaster. This is the last opportunity
		 * for this message to be delivered. Send the text with
		 * reason for the bounce, and the headers of the original
		 * message. Don't bother sending the boiler-plate text.
		 */
		if (!bounce_header(bounce, bounce_info, var_2bounce_rcpt,
				   POSTMASTER_COPY)
		    && bounce_recipient_log(bounce, bounce_info) == 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_recipient_dsn(bounce, bounce_info) == 0)
		    bounce_original(bounce, bounce_info, DSN_RET_FULL);
		bounce_status = post_mail_fclose(bounce);
		if (bounce_status == 0)
		    msg_info("%s: postmaster non-delivery notification: %s",
			     queue_id, STR(new_id));
	    }
	}
    }

    /*
     * Non-bounce failed. Send a single bounce, subject to DSN NOTIFY
     * restrictions.
     */
    else {
	RECIPIENT *rcpt = &bounce_info->rcpt_buf->rcpt;

	if (rcpt->dsn_notify != 0		/* compat */
	    && (rcpt->dsn_notify & DSN_NOTIFY_FAILURE) == 0) {
	    bounce_status = 0;
	} else {
	    if ((bounce = post_mail_fopen_nowait(NULL_SENDER, orig_sender,
						 INT_FILT_MASK_BOUNCE,
						 NULL_TRACE_FLAGS,
						 new_id)) != 0) {

		/*
		 * Send the bounce message header, some boilerplate text that
		 * pretends that we are a polite mail system, the text with
		 * reason for the bounce, and a copy of the original message.
		 */
		if (bounce_header(bounce, bounce_info, orig_sender,
				  NO_POSTMASTER_COPY) == 0
		    && bounce_boilerplate(bounce, bounce_info) == 0
		    && bounce_recipient_log(bounce, bounce_info) == 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_recipient_dsn(bounce, bounce_info) == 0)
		    bounce_original(bounce, bounce_info, dsn_ret ?
				    dsn_ret : DSN_RET_FULL);
		bounce_status = post_mail_fclose(bounce);
		if (bounce_status == 0)
		    msg_info("%s: sender non-delivery notification: %s",
			     queue_id, STR(new_id));
	    }
	}

	/*
	 * Optionally send a postmaster notice, subject to notify_classes
	 * restrictions.
	 * 
	 * This postmaster notice is not critical, so if it fails don't
	 * retransmit the bounce that we just generated, just log a warning.
	 */
#define SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE (notify_mask & MAIL_ERROR_BOUNCE)

	if (bounce_status == 0 && SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE
	    && strcasecmp(orig_sender, mail_addr_double_bounce()) != 0) {

	    /*
	     * Send the text with reason for the bounce, and the headers of
	     * the original message. Don't bother sending the boiler-plate
	     * text. This postmaster notice is not critical, so if it fails
	     * don't retransmit the bounce that we just generated, just log a
	     * warning.
	     */
	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
						 var_bounce_rcpt,
						 INT_FILT_MASK_BOUNCE,
						 NULL_TRACE_FLAGS,
						 new_id)) != 0) {
		if (bounce_header(bounce, bounce_info, var_bounce_rcpt,
				  POSTMASTER_COPY) == 0
		    && bounce_recipient_log(bounce, bounce_info) == 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_recipient_dsn(bounce, bounce_info) == 0)
		    bounce_original(bounce, bounce_info, DSN_RET_HDRS);
		postmaster_status = post_mail_fclose(bounce);
		if (postmaster_status == 0)
		    msg_info("%s: postmaster non-delivery notification: %s",
			     queue_id, STR(new_id));
	    }
	    if (postmaster_status)
		msg_warn("%s: postmaster notice failed while bouncing to %s",
			 queue_id, orig_sender);
	}
    }

    /*
     * Optionally, delete the recipient from the queue file.
     */
    if (bounce_status == 0 && (flags & BOUNCE_FLAG_DELRCPT))
	bounce_delrcpt_one(bounce_info);

    /*
     * Cleanup.
     */
    bounce_mail_free(bounce_info);
    vstring_free(new_id);

    return (bounce_status);
}
Exemple #4
0
int     bounce_notify_service(int flags, char *service, char *queue_name,
			              char *queue_id, char *encoding,
			              char *recipient, char *dsn_envid,
			              int dsn_ret, BOUNCE_TEMPLATES *ts)
{
    BOUNCE_INFO *bounce_info;
    int     bounce_status = 1;
    int     postmaster_status = 1;
    VSTREAM *bounce;
    int     notify_mask = name_mask(VAR_NOTIFY_CLASSES, mail_error_masks,
				    var_notify_classes);
    VSTRING *new_id = vstring_alloc(10);
    char   *postmaster;
    int     count;

    /*
     * Initialize. Open queue file, bounce log, etc.
     * 
     * XXX DSN The bounce service produces RFC 3464-style "failed mail" reports
     * from information in two following types of logfile:
     * 
     * 1 - bounce: this file is used for RFC 3464-style reports of permanent
     * delivery errors by the bounce(8) service. This reports to the sender
     * all recipients that have no DSN NOTIFY information (compatibility) and
     * all recipients that have DSN NOTIFY=FAILURE; this reports to
     * postmaster all recipients, if postmaster notification is enabled.
     * 
     * 2 - defer: this file is used for three types of report:
     * 
     * 2a) RFC 3464-style "mail is too old" reports by the bounce(8) service.
     * This reports to the sender all recipients that have no DSN NOTIFY
     * information (compatibility) and all recipients that have DSN
     * NOTIFY=FAILURE; this reports to postmaster all recipients, if
     * postmaster notification is enabled.
     * 
     * Other reports that other servers produce from the defer logfile:
     * 
     * 2b) On-demand reports of all delayed deliveries by the showq(8) service
     * and mailq(1) command. This reports all recipients that have a
     * transient delivery error.
     * 
     * 2c) RFC 3464-style "delayed mail" notifications by the defer(8) service.
     * This reports to the sender all recipients that have no DSN NOTIFY
     * information (compatibility) and all recipients that have DSN
     * NOTIFY=DELAY; this reports to postmaster all recipients, if postmaster
     * notification is enabled.
     */
    bounce_info = bounce_mail_init(service, queue_name, queue_id,
				   encoding, dsn_envid, ts->failure);

#define NULL_SENDER		MAIL_ADDR_EMPTY	/* special address */
#define NULL_TRACE_FLAGS	0

    /*
     * The choice of sender address depends on the recipient address. For a
     * single bounce (a non-delivery notification to the message originator),
     * the sender address is the empty string. For a double bounce (typically
     * a failed single bounce, or a postmaster notification that was produced
     * by any of the mail processes) the sender address is defined by the
     * var_double_bounce_sender configuration variable. When a double bounce
     * cannot be delivered, the queue manager blackholes the resulting triple
     * bounce message.
     */

    /*
     * Double bounce failed. Never send a triple bounce.
     * 
     * However, this does not prevent double bounces from bouncing on other
     * systems. In order to cope with this, either the queue manager must
     * recognize the double-bounce recipient address and discard mail, or
     * every delivery agent must recognize the double-bounce sender address
     * and substitute something else so mail does not come back at us.
     */
    if (strcasecmp(recipient, mail_addr_double_bounce()) == 0) {
	msg_warn("%s: undeliverable postmaster notification discarded",
		 queue_id);
	bounce_status = 0;
    }

    /*
     * Single bounce failed. Optionally send a double bounce to postmaster,
     * subject to notify_classes restrictions.
     */
#define ANY_BOUNCE (MAIL_ERROR_2BOUNCE | MAIL_ERROR_BOUNCE)
#define SEND_POSTMASTER_ANY_BOUNCE_NOTICE (notify_mask & ANY_BOUNCE)

    else if (*recipient == 0) {
	if (!SEND_POSTMASTER_ANY_BOUNCE_NOTICE) {
	    bounce_status = 0;
	} else {
	    postmaster = var_2bounce_rcpt;
	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
						 postmaster,
						 INT_FILT_MASK_BOUNCE,
						 NULL_TRACE_FLAGS,
						 new_id)) != 0) {

		/*
		 * Double bounce to Postmaster. This is the last opportunity
		 * for this message to be delivered. Send the text with
		 * reason for the bounce, and the headers of the original
		 * message. Don't bother sending the boiler-plate text.
		 */
		count = -1;
		if (bounce_header(bounce, bounce_info, postmaster,
				  POSTMASTER_COPY) == 0
		    && (count = bounce_diagnostic_log(bounce, bounce_info,
						   DSN_NOTIFY_OVERRIDE)) > 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_diagnostic_dsn(bounce, bounce_info,
					     DSN_NOTIFY_OVERRIDE) > 0) {
		    bounce_original(bounce, bounce_info, DSN_RET_FULL);
		    bounce_status = post_mail_fclose(bounce);
		    if (bounce_status == 0)
			msg_info("%s: postmaster non-delivery notification: %s",
				 queue_id, STR(new_id));
		} else {
		    /* No applicable recipients found - cancel this notice. */
		    (void) vstream_fclose(bounce);
		    if (count == 0)
			bounce_status = 0;
		}
	    }
	}
    }

    /*
     * Non-bounce failed. Send a single bounce to the sender, subject to DSN
     * NOTIFY restrictions.
     */
    else {
	if ((bounce = post_mail_fopen_nowait(NULL_SENDER, recipient,
					     INT_FILT_MASK_BOUNCE,
					     NULL_TRACE_FLAGS,
					     new_id)) != 0) {

	    /*
	     * Send the bounce message header, some boilerplate text that
	     * pretends that we are a polite mail system, the text with
	     * reason for the bounce, and a copy of the original message.
	     */
	    count = -1;
	    if (bounce_header(bounce, bounce_info, recipient,
			      NO_POSTMASTER_COPY) == 0
		&& bounce_boilerplate(bounce, bounce_info) == 0
		&& (count = bounce_diagnostic_log(bounce, bounce_info,
						  DSN_NOTIFY_FAILURE)) > 0
		&& bounce_header_dsn(bounce, bounce_info) == 0
		&& bounce_diagnostic_dsn(bounce, bounce_info,
					 DSN_NOTIFY_FAILURE) > 0) {
		bounce_original(bounce, bounce_info, dsn_ret ?
				dsn_ret : DSN_RET_FULL);
		bounce_status = post_mail_fclose(bounce);
		if (bounce_status == 0)
		    msg_info("%s: sender non-delivery notification: %s",
			     queue_id, STR(new_id));
	    } else {
		/* No applicable recipients found - cancel this notice. */
		(void) vstream_fclose(bounce);
		if (count == 0)
		    bounce_status = 0;
	    }
	}

	/*
	 * Optionally, send a postmaster notice, subject to notify_classes
	 * restrictions.
	 * 
	 * This postmaster notice is not critical, so if it fails don't
	 * retransmit the bounce that we just generated, just log a warning.
	 */
#define SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE (notify_mask & MAIL_ERROR_BOUNCE)

	if (bounce_status == 0 && SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE
	    && strcasecmp(recipient, mail_addr_double_bounce()) != 0) {

	    /*
	     * Send the text with reason for the bounce, and the headers of
	     * the original message. Don't bother sending the boiler-plate
	     * text. This postmaster notice is not critical, so if it fails
	     * don't retransmit the bounce that we just generated, just log a
	     * warning.
	     */
	    postmaster = var_bounce_rcpt;
	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
						 postmaster,
						 INT_FILT_MASK_BOUNCE,
						 NULL_TRACE_FLAGS,
						 new_id)) != 0) {
		count = -1;
		if (bounce_header(bounce, bounce_info, postmaster,
				  POSTMASTER_COPY) == 0
		    && (count = bounce_diagnostic_log(bounce, bounce_info,
						   DSN_NOTIFY_OVERRIDE)) > 0
		    && bounce_header_dsn(bounce, bounce_info) == 0
		    && bounce_diagnostic_dsn(bounce, bounce_info,
					     DSN_NOTIFY_OVERRIDE) > 0) {
		    bounce_original(bounce, bounce_info, DSN_RET_HDRS);
		    postmaster_status = post_mail_fclose(bounce);
		    if (postmaster_status == 0)
			msg_info("%s: postmaster non-delivery notification: %s",
				 queue_id, STR(new_id));
		} else {
		    /* No applicable recipients found - cancel this notice. */
		    (void) vstream_fclose(bounce);
		    if (count == 0)
			postmaster_status = 0;
		}
	    }
	    if (postmaster_status)
		msg_warn("%s: postmaster notice failed while bouncing to %s",
			 queue_id, recipient);
	}
    }

    /*
     * Optionally, delete the recipients from the queue file.
     */
    if (bounce_status == 0 && (flags & BOUNCE_FLAG_DELRCPT))
	bounce_delrcpt(bounce_info);

    /*
     * Examine the completion status. Delete the bounce log file only when
     * the bounce was posted successfully, and only if we are bouncing for
     * real, not just warning.
     */
    if (bounce_status == 0 && mail_queue_remove(service, queue_id)
	&& errno != ENOENT)
	msg_fatal("remove %s %s: %m", service, queue_id);

    /*
     * Cleanup.
     */
    bounce_mail_free(bounce_info);
    vstring_free(new_id);

    return (bounce_status);
}