release_notes

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		"Internet for Schools" project (IdS).
	SECURITY: There is a potential for a denial of service attack if
		the AutoRebuildAliases option is set as a user can kill the
		sendmail process while it is rebuilding the aliases file
		(leaving it in an inconsistent state).  This option and
		its use is deprecated and will be removed from a future
		version of sendmail.
	SECURITY: Make sure all file descriptors (besides stdin, stdout, and
		stderr) are closed before restarting sendmail.  Problem noted
		by Michal Zalewski of the "Internet for Schools" project
		(IdS).
	Begin using /etc/mail/ for sendmail related files.  This affects
		a large number of files.  See cf/README for more details.
	The directory structure of the distribution has changed slightly
		for easier code sharing among the programs.
	Support SMTP AUTH (see RFC 2554).  New macros for this purpose
		are ${auth_authen}, ${auth_type}, and ${auth_author}
		which hold the client's authentication credentials,
		the mechanism used for authentication, and the
		authorization identity (i.e., the AUTH= parameter if
		supplied).  Based on code contributed by Tim Martin of CMU.
	On systems which use the Torek stdio library (all of the BSD
		distributions), use memory-buffered files to reduce
		file system overhead by not creating temporary files on
		disk.  Contributed by Exactis.com, Inc.
	New option DataFileBufferSize to control the maximum size of a
		memory-buffered data (df) file before a disk-based file is
		used.  Contributed by Exactis.com, Inc.
	New option XscriptFileBufferSize to control the maximum size of a
		memory-buffered transcript (xf) file before a disk-based
		file is used.  Contributed by Exactis.com, Inc.
	sendmail implements RFC 2476 (Message Submission), e.g., it can
		now listen on several different ports.  Use:
		O DaemonPortOptions=Name=MSA, Port=587, M=E
		to run a Message Submission Agent (MSA); this is turned
		on by default in m4-generated .cf files; it can be turned
		off with FEATURE(`no_default_msa').
	The 'XUSR' SMTP command is deprecated.  Mail user agents should
		begin using RFC 2476 Message Submission for initial user
		message submission.  XUSR may disappear from a future release.
	The new '-G' (relay (gateway) submission) command line option
		indicates that the message being submitted from the command
		line is for relaying, not initial submission.  This means
		the message will be rejected if the addresses are not fully
		qualified and no canonicalization will be done.  Future
		releases may even reject improperly formed messages.
	The '-U' (initial user submission) command line option is
		deprecated and may be removed from a future release.
		Mail user agents should begin using '-G' to indicate that
		this is a relay submission (the inverse of -U).
	The next release of sendmail will assume that any message submitted
		from the command line is an initial user submission and act
		accordingly.
	If sendmail doesn't have enough privileges to run a .forward
		program or deliver to file as the owner of that file, the
		address is marked as unsafe.  This means if RunAsUser is
		set, users won't be able to use programs or delivery to
		files in their .forward files.  Administrators can override
		this by setting the DontBlameSendmail option to the new
		setting NonRootSafeAddr.
	Allow group or world writable directories if the sticky bit is set
		on the directory and DontBlameSendmail is set to
		TrustStickyBit.  Based on patch from Chris Metcalf of
		InCert Software.
	Prevent logging of unsafe directory paths for non-existent forward
		files if the new DontWarnForwardFileInUnsafeDirPath bit is
		set in the DontBlameSendmail option.  Requested by many.
	New Timeout.control option to limit the total time spent satisfying
		a control socket request.
	New Timeout.resolver options for controlling BIND resolver
		settings:
		Timeout.resolver.retrans
			Sets the resolver's retransmission time interval (in
			seconds).  Sets both Timeout.resolver.retrans.first
			and Timeout.resolver.retrans.normal.
		Timeout.resolver.retrans.first
			Sets the resolver's retransmission time interval (in
			seconds) for the first attempt to deliver a message.
		Timeout.resolver.retrans.normal
			Sets the resolver's retransmission time interval (in
			seconds) for all resolver lookups except the first
			delivery attempt.
		Timeout.resolver.retry
			Sets the number of times to retransmit a resolver
			query.  Sets both Timeout.resolver.retry.first
			and Timeout.resolver.retry.normal.
		Timeout.resolver.retry.first
			Sets the number of times to retransmit a resolver
			query for the first attempt to deliver a message.
		Timeout.resolver.retry.normal
			Sets the number of times to retransmit a resolver
			query for all resolver lookups except the first
			delivery attempt.
		Contributed by Exactis.com, Inc.
	Support multiple queue directories.  To use multiple queues, supply
		a QueueDirectory option value ending with an asterisk.  For
		example, /var/spool/mqueue/q* will use all of the
		directories or symbolic links to directories beginning with
		'q' in /var/spool/mqueue as queue directories.  Keep in
		mind, the queue directory structure should not be changed
		while sendmail is running.  Queue runs create a separate
		process for running each queue unless the verbose flag is
		given on a non-daemon queue run.  New items are randomly
		assigned to a queue.  Contributed by Exactis.com, Inc.
	Support different directories for qf, df, and xf queue files; if
		subdirectories or symbolic links to directories of those names
		exist in the queue directories, they are used for the
		corresponding queue files.  Keep in mind, the queue
		directory structure should not be changed while sendmail is
		running.  Proposed by Mathias Koerber of Singapore
		Telecommunications Ltd.
	New queue file naming system which uses a filename guaranteed to be
		unique for 60 years.  This allows queue IDs to be assigned
		without fancy file system locking.  Queued items can be
		moved between queues easily.  Contributed by Exactis.com,
		Inc.
	Messages which are undeliverable due to temporary address failures
		(e.g., DNS failure) will now go to the FallBackMX host, if
		set.  Contributed by Exactis.com, Inc.
	New command line option '-L tag' which sets the identifier used for
		syslog.  Contributed by Exactis.com, Inc.
	QueueSortOrder=Filename will sort the queue by filename.  This
		avoids opening and reading each queue file when preparing
		to run the queue.  Contributed by Exactis.com, Inc.
	Shared memory counters and microtimers functionality has been
		donated by Exactis.com, Inc.
	The SCCS ID tags have been replaced with RCS ID tags.
	Allow trusted users (those on a T line or in $=t) to set the
		QueueDirectory (Q) option without an X-Authentication-Warning:
		being added.  Suggested by Michael K. Sanders.
	IPv6 support based on patches from John Kennedy of Cal State
		University, Chico, Motonori Nakamura of Kyoto University,
		and John Beck of Sun Microsystems.
	In low-disk space situations, where sendmail would previously refuse
		connections, still accept them, but only allow ETRN commands.
		Suggested by Mathias Koerber of Singapore Telecommunications
		Ltd.
	The [IPC] builtin mailer now allows delivery to a UNIX domain socket
		on systems which support them.  This can be used with LMTP
		local delivery agents which listen on a named socket.  An
		example mailer might be:
			Mexecmail, P=[IPC], F=lsDFMmnqSXzA5@/:|, E=\r\n,
				S=10, R=20/40, T=DNS/RFC822/X-Unix,
				A=FILE /var/run/lmtpd
		Code contributed by Lyndon Nerenberg of Messaging Direct.
	The [TCP] builtin mailer name is now deprecated.  Use [IPC]
		instead.
	The first mailer argument in the [IPC] mailer is now checked for a
		legitimate value.  Possible values are TCP (for TCP/IP
		connections), IPC (which will be deprecated in a future
		version), and FILE (for UNIX domain socket delivery).
	PrivacyOptions=goaway no longer includes the noetrn and the noreceipts
		flags.
	PrivacyOptions=nobodyreturn instructs sendmail not to include the
		body of the original message on delivery status
		notifications.
	Don't announce DSN if PrivacyOptions=noreceipts is set.  Problem noted
		by Dan Bernstein, fix from Robert Harker of Harker Systems.
	Accept the SMTP RSET command even when rejecting commands due to TCP
		Wrappers or the check_relay ruleset.  Problem noted by
		Steve Schweinhart of America Online.
	Warn if OperatorChars is set multiple times.  OperatorChars should
		not be set after rulesets are defined.  Suggested by
		Mitchell Blank Jr of Exec-PC.
	Do not report temporary failure on delivery to files.  In
		interactive delivery mode, this would result in two SMTP
		responses after the DATA command.  Problem noted by
		Nik Conwell of Boston University.
	Check file close when mailing to files.  Problem noted by Nik
		Conwell of Boston University.
	Avoid a segmentation fault when using the LDAP map.  Patch from
		Curtis W. Hillegas of Princeton University.
	Always bind to the LDAP server regardless of whether you are using
		ldap_open() or ldap_init().  Fix from Raj Kunjithapadam of
		@Home Network.
	New ruleset trust_auth to determine whether a given AUTH=
		parameter of the MAIL command should be trusted.  See SMTP
		AUTH, cf/README, and doc/op/op.ps.
	Allow new named config file rules check_vrfy, check_expn, and
		check_etrn for VRFY, EXPN, and ETRN commands, respectively,
		similar to check_rcpt etc.
	Introduce new macros ${rcpt_mailer}, ${rcpt_host}, ${rcpt_addr},
		${mail_mailer}, ${mail_host}, ${mail_addr} that hold
		the results of parsing the RCPT and MAIL arguments, i.e.
		the resolved triplet from $#mailer $@host $:addr.
		From Kari Hurtta of the Finnish Meteorological Institute.
	New macro ${client_resolve} which holds the result of the resolve
		call for ${client_name}: OK, FAIL, FORGED, TEMP.  Proposed
		by Kari Hurtta of the Finnish Meteorological Institute.
	New macros ${dsn_notify}, ${dsn_envid}, and ${dsn_ret} that hold
		the corresponding DSN parameter values.  Proposed by
		Mathias Herberts.
	New macro ${msg_size} which holds the value of the SIZE= parameter,
		i.e., usually the size of the message (in an ESMTP dialogue),
		before the message has been collected, thereafter it holds
		the message size as computed by sendmail (and can be used
		in check_compat).
	The macro ${deliveryMode} now specifies the current delivery mode
		sendmail is using instead of the value of the DeliveryMode
		option.
	New macro ${ntries} holds the number of delivery attempts.
	Drop explicit From: if same as what would be generated only if it is
		a local address.  From Motonori Nakamura of Kyoto University.
	Write pid to file also if sendmail only processes the queue.
		Proposed by Roy J. Mongiovi of Georgia Tech.
	Log "low on disk space" only when necessary.
	New macro ${load_avg} can be used to check the current load average.
		Suggested by Scott Gifford of The Internet Ramp.
	Return-Receipt-To: header implies DSN request if option RrtImpliesDsn
		is set.
	Flag -S for maps to specify the character which is substituted
		for spaces (instead of the default given by O BlankSub).
	Flag -D for maps: perform no lookup in deferred delivery mode.
		This flag is set by default for the host map.  Based on a
		proposal from Ian MacPhedran of the University of Saskatchewan.
	Open maps only on demand, not at startup.
	Log warning about unsupported IP address families.
	New option MaxHeadersLength allows to specify a maximum length
		of the sum of all headers.  This can be used to prevent
		a denial-of-service attack.
	New option MaxMimeHeaderLength which limits the size of MIME
		headers and parameters within those headers.  This option
		is intended to protect mail user agents from buffer
		overflow attacks.
	Added option MaxAliasRecursion to specify the maximum depth of
		alias recursion.
	New flag F=6 for mailers to strip headers to seven bit.
	Map type syslog to log the key via syslogd.
	Entries in the alias file can be continued by putting a backslash
		directly before the newline.
	New option DeadLetterDrop to define the location of the system-wide
		dead.letter file, formerly hardcoded to
		/usr/tmp/dead.letter.  If this option is not set (the
		default), sendmail will not attempt to save to a
		system-wide dead.letter file if it can not bounce the mail
		to the user nor postmaster.  Instead, it will rename the qf
		file as it has in the past when the dead.letter file
		could not be opened.
	New option PidFile to define the location of the pid file.  The
		value of this option is macro expanded.
	New option ProcessTitlePrefix specifies a prefix string for the
		process title shown in 'ps' listings.
	New macros for use with the PidFile and ProcessTitlePrefix options
		(along with the already existing macros):
		${daemon_info}      Daemon information, e.g.
		                    SMTP+queueing@00:30:00