HISTORY

In addition to the names listed below, the following people provided
useful inputs on many occasions: Paul D. Robertson, Simon J. Mudd.
Apologies for any names omitted.

19980105

	The compiled-in default value for resolve_smtp_sender was
	wrong (from the days that it was a boolean), causing smtpd
	to dump core when the variable was not set in main.cf.

	The INSTALL instructions now have separate sections for
	the three basic ways of running vmailer.

	The INSTALL instructions now have discusses how to deal
	with chrooted processes.

	Ported to RedHat 5.0. My, these people have re-organized
	their include files quite a bit, haven't they.

19980106

	On RedHat Linux 4.2/5.0, when a FIFO listener opens the
	FIFO with mode O_RDONLY, the FIFO remains forever readable
	after the writer has closed it.  Workaround: open the FIFO
	mode O_RDWR.

	Test program: util/fifo_rdonly_bug.c

	Unfortunately, the above fix triggers a bug on BSD/OS 3.1
	where opening the FIFO mode O_RDWR causes select() to claim
	that the FIFO is readable even before any data is written
	to it, causing read() to block or to fail.

	Test program:  util/fifo_rdwr_bug.c

	printfck (check arguments of printf-like function calls)
	found a missing argument in local/command.c

	Miscellaneous Makefile cleanups that I didn't finish before
	the first alpha release.

19980107

	Sometimes the DNS will claim that a domain does not exist,
	when in fact it does. Thus, it is a bad idea to reject mail
	from apparently non-existent domains. I have changed the
	smtpd so that it produces a soft error responses when a
	resolve_smtp_sender test fails with HOST_NOT_FOUND.  Note:
	by default, this test is still disabled.

	The DB and DBM read routines will now automagically figure
	out if (key, value) pairs were written including a terminating
	null byte or not. The DB and DBM write routines will use
	this result to determine how to write, and will fall back
	to per-system defaults otherwise.

	Renamed the README to MUSINGS, and wrote up a README that
	reflects the current status of the software.

	Added -d (don't disconnect) and -c (show running counter)
	option to te smtp-source test program. These tools are
	great torture tests for the mail software, and for the
	system that it runs on.

	Turned down the process_limit parameter (# of parallel smtp
	clients or servers) to avoid unpleasant surprises. You can
	crank up the process_limit parameter in main.cf.

19980111

	Feature: when run by the superuser, mailq now shows the
	mail queue even when the mail system is down. To this end,
	mailq (sendmail -bp) runs the showq program directly instead
	of connecting to the UNIX-domain service socket, and drops
	privileges etc.  as usual.

19980119

	Bugfix: Edwin Kremer spotted an oversight in the negated
	host matching code (for name or address patterns prefixed
	by !).

	Bugfix: upon receipt of a SIGHUP signal, the master now
	disconnects from its child processes, so that the current
	generation of child processes commits suicide, and so that
	the next generation of child processes will use the new
	configuration settings.

	Bugfix: the smtp server now skips the sender DNS domain
	lookup test for foo@[address]

	Bugfix: don't append the local domain to foo@[address]

19980120

	Bugfix: old low-priority bug in some list walk code that
	caused the master to drop core when a service was turned
	off in master.cf.

	Robustness: the mail system should be able to start up and
	to accept local postings even while the naming service is
	down.  For this reason, the mail system no longer uses
	gethostbyname() to look up its own machine name.  Sites
	that use short hostnames will have to specify their FQDN
	in main.cf (this will eventually be done by the system
	installation/configuration procedure). Should the config
	language support backticks so one can say `domainname`? What
	about $name stuff between the backtics?

	Security: the master now creates FIFOs and UNIX-domain
	sockets as the mail owner instead of as root, for better
	protection against subverted mail systems. chmod() is
	susceptible to race conditions. fchmod(), although safer,
	often does not work on sockets.

	Portability: anticipate that all major UNIXes will create
	UNIX-domain sockets with permissions modified by the process
	umask (required by POSIX). For this reason, we always
	chmod() UNIX-domain sockets, unless the system allows us
	to use the safer fchmod() instead.

	Portability: the semi-resident servers now properly handle
	EWOULDBLOCK returns from accept()  in addition to EGAIN
	(on some systems, EAGAIN and EWOULDBLOCK have different
	values).

	Bugfix: the semi-resident servers now properly handle EINTR
	returns From accept().

	Bugfix: Edwin Kremer found that mynetworks() would compute
	(32 - mask) instead of mask.

19980121

	Feature: /etc/vmailer/relocated is used by the local delivery
	program and specifies what mail should be bounced with a
	"user has moved to XXX" message. The main.cf configuration
	parameter is "relocated_maps".  Just like the "virtual_maps"
	config parameter, this feature is off by default, and the
	parameter can have values such as "files" or "files, nis"
	(on hosts equipped with NIS).

19980123

	Cleanup: virtual domain support moved from the queue manager
	to the resolve service, where it belongs.

	Feature: /etc/vmailer/canonical is used by the rewrite
	service for all addresses, and maps a canonical address
	(user@domain) to another address.  Typical use is to generate
	Firstname.Lastname@domain addresses, or to clean up dirty
	addresses from non-RFC 822 mail systems. The main.cf
	configuration parameter is "canonical_maps".  Just like
	the "virtual_maps" config parameter, this feature is off
	by default, and the parameter can have values such as
	"files" or "files, nis" (on hosts equipped with NIS).

19980124

	HPUX10 port and many little fixes from Pieter Schoenmakers.

	Bugfix: isolated an old mysterious bug that could make the
	master deaf for new connections while no child process was
	running.  A typical result was that no pickup daemon would
	be started after the previous one had terminated voluntarily.

	Bugfix: the NIS lookup code did not mystrdup() the NIS map
	name and would access free()d memory.

19980125

	Bugfix: the vstream routines would sometimes ignore flushing
	errors. The error would still be reported by vstream_fclose()
	and vstream_ferror().

	Feature: time limit on delivery to shell commands.  Config
	parameter: command_time_limit. Default value: 100 sec. The
	idea is to prevent one bad .forward file or alias file
	entry from slowly using up all local delivery process slots.

19980126

	Code cleanup: in preparation for SMTP extensions such as
	SIZE, allow an extended SMTP command to have a variable
	number of options.

19980127

	Bugfix: moved canonical map lookups away from the rewriting
	module to the cleanup service, so that canonical map lookups
	do not interfere with address rewriting on behalf of other
	programs. Back to an older trivial-rewrite program version.

	Bugfix: moved virtual map lookups away from the resolver
	back to the queue manager, so that virtual domain lookup
	does not interfere with address resolution on behalf of
	other programs. Back to an older qmgr program version.

19980131

	Feature: integrated and adapted Guido van Rooij's SIZE
	option (RFC 1870), carefully avoiding potential problems
	due to overflow (by multiplying large numbers) or unsigned
	underflow (by subtracting numbers).

	Code cleanup: cleaned up the code that parses the server
	response to the HELO/EHLO command, so that we can more
	reliably recognize what options a server supports.

19980201

	Portability: integrated the IRIX 6 port by Oved Ben-Aroya.

	Portability: the software now figures out by itself if a
	server should open its FIFO read-write or read-only, to
	avoid getting stuck with a FIFO that stays readable forever.

	Bugfix: the cleanup service would terminate with a fatal
	vstream_fseek() error when the queue file was too large.

	Bugfix: the cleanup service could be killed by a signal
	when the queue file became too large.

19980203

	Portability: some systems have statfs(), some have statvfs(),
	and the relevant include files are in a different place on
	almost every system.

	Portability: the makedefs script now nukes the -O compiler
	flag when building on AIX with IBM's own compiler...

19980204

	Portability: HP-UX 9.x support by Pieter Schoenmakers.

	Portability: added SYSV-style ulimit() file size limit
	support for HP-UX 9.x.

	Portability: added some #includes that appeared to be
	missing according to the Digital UNIX cc compiler.

	Bugfix: sys_defs.h now correctly specifies NIS support for
	LINUX2, HPUX9 and HPUX10.

	Security: fixed a file descriptor leak in the local delivery
	agent that could give shell commands access to the VMailer
	IPC streams. This should not cause a vulnerability, given
	the design and implementation of the mailer, but it would
	be like asking for trouble.

	Bugfix: the sendmail -B (body type) option did not take a
	value.

19980205

	Bugfix (SUNOS5): should not have deleted the SVID_GETTOD
	definition from util/sys_defs.h.

	Bugfix (HPUX9): forgot to specify whether to use statfs()
	or statvfs().

	Bugfix (HPUX9): don't try to raise the file size ulimit.

	Bugfix (HPUX9): must specify file size limit in 512-blocks.

19980207

	Robustness: the master process now raises the file size
	limit when it is started with a limit that is less than
	VMailer's file size limit.  File: util/file_limit.c.

	Security: the dns lookup routines now screen all result
	names with valid_hostname(). Bad names are treated as
	transient errors.

	Feature: qmail compatibility: when the home_mailbox parameter
	is set, mail is delivered to ~/$home_mailbox instead of to
	/var[/spool]/mail/username.  This hopefully makes it easier
	to lure people away from qmail :-)

	Robustness: several testers by accident configured relayhost
	the same as myhostname. The programs now explicitly check
	for this mistake.

	Bugfix: deliver_request_read() would free unallocated memory
	when it received an incomplete delivery request from the
	queue manager.

	Robustness: local_destination_concurrency=1 prevents parallel
	delivery to the same user (with possibly disastrous effects
	when that user has an expensive pipeline in the .forward
	or procmail config file).  Each transport can have its own
	XXX_destination_concurrency parameter, to limit the number
	of simultaneous deliveries to the same destination.

19980208

	Robustness: added "slow open" mode, to gradually increase
	the number of simultaneous connections to the same site as
	long as delivery succeeds, and to gradually decrease the
	number of connections while delivery fails. Brad Knowles
	provided the inspiration to do this.

	This also solves the "thundering herd" problem (making a
	bunch of connections to a dead host when it was time to
	retry that host). Let's see when other mailers fix this.

	Feature: Added $smtpd_banner and $mail_version, for those
	who want to show the world what software version they are
	running.

	Bugfix: vmailer-script now properly labels each syslog
	entry.

19980210

	Portability: merged in NEXTSTEP 3 port from Pieter Schoenmakers

	Bugfix: the local delivery program now checks that a
	destination is a regular file before locking it.

19980211

	Robustness: the local delivery agent sets HOME, LOGNAME,
	and SHELL when delivering to a user shell command. PATH is
	always set, and TZ is passed through if it is set.

19980212

	Feature: mailq (sendmail -bp) now also lists the maildrop
	queue (with mail that hasn't been picked up yet).

19980213

	Feature: the smtpd now says: 502 HELP not implemented. This
	should impress the heck out of the competition :-)

19980214

	Feature: local delivery to configurable system-wide command
	(e.g.  procmail) avoids the need for per-user ~/.forward
	shell commands. Config parameter: mailbox_command.

19980215

	Performance: avoid running a shell when a command contains
	no shell magic characters or built-in shell commands. This
	speeds up delivery to all commands. File: util/exec_command.c.

	Bugfix: the local delivery agent, after reading EOF from
	a child process, now sends SIGKILL only when the child does
	not terminate within a limited amount of time. This avoids
	some problems with procmail.  File:  util/timed_wait.c.

19980217

	Portability: folded in NetInfo support from Pieter
	Schoenmakers.

19980218

	Feature: new vmlock command to run a command while keeping
	an exclusive lock on a mailbox.

	Feature: with "recipient_delimiter = +", mail for local
	address "user+foo" is delivered to "foo", with a "Delivered-To:
	user+foo@domain" message header. Files: qmgr/qmgr_message.c,
	local/recipient.c. This must be the cheapest feature.

19980219

	Code cleanup: moved error handling into functions that
	should always succeed (non_blocking(), close_on_exec()).

19980223

	Bugfix: null pointer bug in the cleanup program after
	processing a From: header with no mail address (or with
	only a comment).

19980226

	Robustness: now detects when getpwnam() returns a name that
	differs from the requested name.

	Feature: Added %p support to the vbuf_print formatting
	module.

	Code cleanup: revamped the alias/include/.forward loop
	detection and duplicate suppression code in the local
	delivery agent. This must be the fourth iteration, and
	again the code has been simplified.

19980228

	Robustness: don't treat anything starting with whitespace
	as a header record. Instead, explicitly test for leading
	whitespace where we permit it. Files: global/is_header.c,
	bounce/bounce_flush_service.c, local/delivered.c.

19980301

	Compatibility: the sendmail program now accepts the -N
	command-line option (delivery status notification) but
	ignores it entirely, just like many other sendmail options.

	Bugfix: dns_lookup.c was too conservative with buffer sizes
	and would incorrectly report "malformed name server reply".

19980302

	Bugfix: the local delivery agent was not null-byte clean.

19980307

	Feature: integrated Pieter Schoenmaker's code for transport
	lookup tables that list (transport, nexthop) by destination.

19980309

	Bugfix: delivery agents no longer rename corrupt queue
	files, because programs might fall over each other doing
	so. Instead, when a delivery agent detects queue file
	corruption, it chmods the queue file, simulates a soft
	error, and lets the queue manager take care of the problem.

	Bugfix: the SMTP server implemented VRFY incorrectly.

	Feature: first shot at a pipe mailer, which can be used to
	extend VMailer with external mail transports such as UUCP
	(provided that the remote site understands domain addressing,
	because VMailer version 1 does not rewrite addresses).

	Cleanup: extended the master/child interface so that the
	service name (from master.cf) is passed on to the child.
	The pipe mailer needs the service name so it can look up
	service-specific configuration parameters (privilege level,
	recipient limit, time limit, and so on).

19980310-12

	Cleanup: factored out the pipe_command() code, so it can
	be shared between pipe mailer and local delivery agent.

19980314

	Compatibility: the sendmail program now parses each
	command-line recipient as if it were an RFC 822 message
	header; some MUAs specify comma-separated recipients in a
	command-line argument; and some MUAs even specify "word
	word <address>" forms as command-line arguments.

19980315

	Bugfix: VMailer's queue processing randomization wasn't
	adequate for unloaded systems with small backlogs.

	Bugfix: smtpd now uses double-buffered stream I/O to prevent
	loss of input sent ahead of responses.

19980316

	Bugfix: the smtpd anti-relay code didn't treat all hosts
	listed in $mydestinations as local, so it would accept mail
	only for hosts listed in $relay_domains (default: my own
	domain).

	Bugfix: smtpd now replies with 502 when given an unknown
	command.

19980318

	Cleanup: resolve/rewrite clients now automatically disconnect
	after a configurable amount of idle time (ipc_idle).

19980322

	Tolerance: VRFY now permits user@domain, even though the
	RFC requires that special characters such as @ be escaped.

19980325

	Bugfix: a recipient delimiter of "-" could interfere with
	special addresses such as owner-xxx or double-bounce.

	Tolerance: the SMTP client now permits blank lines in SMTP
	server responses.

	Tolerance: the SMTP client now falls back to SMTP when it
	apparently mistook an SMTP server as ESMTP capable.

	Bugfix: eliminated strtok() calls in favor of mystrtok().
	Symptom: master.cf parsing would break if $inet_interfaces
	was more than one word.

19980328

	Bugfix: user->addr patterns in canonical and virtual tables
	matched only $myorigin, not hosts listed in $mydestination
	or addresses listed in $inet_interfaces.  The man pages
	were wrong too. File: global/addr_match.c.

19980401

	Robustness: FIFO file permissions now default to 0622.  On
	some systems, opening a FIFO read-only could deafen the
	pickup daemon.  Only the listener end (which is opened as
	root) needs read access anyway, so there should not be a
	loss of functionality by making FIFOs non-readable for
	non-mail processes.

19980402

	Compatibility: sendmail -I and -c options added.

19980403

	Feature: virtual lookups are now recursive. File:
	qmgr/qmgr_message.c

19980405

	Implemented sendmail -bs (stand-alone) mode. This mode runs
	as the user and therefore deposits into the maildrop queue.

19980406

	The pickup service now removes malformed maildrop files.

19980407

	The pickup service now guards against maildrop files with
	time stamps dated into the future.

19980408

	Bugfix: in the canonical and virtual maps, foo->address
	would match foo@$myorigin only. This has been fixed to also
	match hosts listed in main.cf:$mydestination and the
	addresses listed in main.cf:$inet_interfaces.

	Bugfix: added double buffering support to the VMailer SMTP
	server. This makes the SMTP server robust against SMTP
	clients that talk ahead of time, and should have been in
	there from day one.

19980409

	Bugfix: the VMailer SMTP client now recognizes its own
	hostname in the SMTP greeting banner only when that name
	appears as the first word on the first line.

19980410

	Feature: smtpd now logs the local queue ID along with the
	client name/address, and pickup now logs the local queue
	ID along with the message owner.

	Bugfix: still didn't do virtual/canonical lookups right
	(code used the non-case-folded key instead of the case
	folded one).

19980418

	Bugfix: the SMTP server did not flush the "250 OK queued
	as XXXX" message from the SMTP conversation history.

19980419

	Bugfix: qmgr would not notice that a malformed message has
	multiple senders, and would leak memory (Tom Ptacek).

19980421

	Portability: in the mantools scripts, the expr pattern no
	longer has ^ at the beginning, and the scripts now use the
	expand program instead of my own detab utility.

19980425

	NetBSD 1.x patch by Soren S. Jorvang.

19980511

	Feature: the SMTP server now logs the protocol (SMTP or
	ESMTP) as part of the Received: header.

	Feature: smtpd now logs the last command when a session is
	aborted due to timeout, unexpected EOF, or too many client
	errors.

19980514

	Bugfix: the queue manager did not update the counter for
	in-core message structures, so the in-core message limit
	had no effect. This can be bad when you have a large backlog
	with many messages eligible for delivery.

	Robustness: the queue manager now also limits the total
	number of in-core recipient structures, so that it won't
	use excessive amounts of memory on sites that have large
	mailing lists.

19980518

	Bugfix: the SMTP client did not notice that the DNS client
	received a truncated response. As a result, a backup MX
	host could incorrectly claim that it was the best MX host
	and declare a mailer loop.

	Added start_msg/stop_msg entries to the vmailer startup
	script, for easy installation.

	Cleanup: VMailer databases are now explicitly specified as
	type:name, for example, hash:/etc/aliases or nis:mail.aliases,
	instead of implicitly as "files", "nis" and so on. Test
	program:  util/dict_open.  This change allowed me to
	eliminate a lot of redundant code from mkmap_xxx.c, and
	from everything that does map lookups.

19980525

	Bugfix: local/dotforward.c compared the result of opening
	a user's ~/.forward against the wrong error value.

19980526

	Bugfix: the smtpd VRFY command could look at free()d memory.

	Robustness: the smtpd program had a fixed limit on the
	number of token structures.  The code now dynamically
	allocates token structures.

	Bugfix: the queue manager still used the deprecated parameter
	name xxx_deliver_concurrency for concurrency control, but
	the documentation talks about the preferred parameter name
	xxx_destination_concurrency.  Fix: try xxx_destination_concurrency
	first, then fall back to xxx_deliver_concurrency.

19980621-19980702

	Cleanup: the string read routines now report the last
	character read or VSTREAM_EOF. This change is necessary
	for the implementation of the long SMTP line bugfix.

	Bugfix: the smtp server exited the DATA command prematurely
	when the client sent long lines. Reason: the smtp server
	did not remember that it broke long lines, so that '.'
	could appear to be the first character on a line when in
	fact it wasn't.

	Bugfix: the queue manager made lots of stupid errors while
	reading $qmgr_message_recipient_limit chunks of recipients
	from a queue file. This code has been restructured.

19980706

	Performance: the cleanup program now always adds return-receipt
	and errors-to records to a queue file, so that the queue
	manager does not have to plow through huge lists of
	recipients.

	Robustness: the initial destination concurrency now defaults
	to 2, so that one bad message or one bad connection does
	not stop all mail to a site. The configuration parameter
	is called initial_destination_concurrency.

	Performance: the per-message recipient limit is now enforced
	by the queue manager instead of by the transport. Thus, a
	large list of recipients for the same site is now mapped
	onto several delivery requests which can be handled in
	parallel, instead of being mapped onto one delivery request
	that is sent to limited numbers of recipients, one group
	after the other.

19980707

	Cleanup: the queue manager now does an additional recipient
	sort after the recipients have been resolved, so that the
	code can do better aggregation of recipients by next hop
	destination.

	Feature: lines in the master.cf file can now be continued
	in the same manner as lines in the main.cf file, i.e. by
	starting the next line with whitespace.

	Feature: the smtp client now warns that a message may be
	delivered multiple times when the response to "." is not
	received (the problem described in RFC 1047).

	Cleanup: when the queue manager changes its little mind
	after contacting a delivery agent (for example, it decides
	to skip the host because a transport or host goes bad),
	the delivery agent no longer complains about premature EOF.
	File: global/deliver_request.c

19980709

	Bugfix: when breaking long lines, the SMTP client did not
	escape leading dots in secondary etc. line fragments.  Fix:
	don't break lines. This change makes VMailer line-length
	transparent.  Files: global/smtp_stream.c, smtp/smtp_proto.c.

19980712

	Cleanup: the queue manager to deliver agent protocol now
	distinguishes between domain-specific soft errors and
	recipient-specific soft errors.  Result: many soft errors
	with SMTP delivery no longer affect other mail the same
	domain.

19980713

	Feature: the file modification time stamp of deferred queue
	files is set to the nearest wakeup time of their recipient
	hosts, or if delivery was deferred due to a non-host problem,
	the time stamp is set into the future by the configurable
	minimal backoff time.

	Bugfix: the SMTP client and the MAILQ command would report
	as message size the total queue file size. That would
	grossly overestimate the size of a message with many
	recipients.

	Bugfix: the 19980709 fix screwed up locally-posted mail
	that didn't end in newline.

19980714

	Robustness: the makedefs script now defaults to no optimization
	when compiling for purify.

19980715

	Robustness: the makedefs script now defaults to no optimization
	when compiling with gcc 2.8, until this compiler is known
	to be OK.

	Workaround: when sending multiple messages over the same
	SMTP connection, some SMTP servers need an RSET command
	before the second etc. MAIL FROM command. The VMailer SMTP
	client now sends a redundant RSET command just in case.

	The queue manager now logs explicitly when delivery is
	deferred because of a "dead" message transport.

19980716

	Feature: mailq and mail bounces now finally report why mail
	was deferred (the reason was logged to the syslog file
	only).  Changes were made to the bounce service (generalized
	to be usable for defer logs), showq service (to show reasons)
	and the queue manager.

	As a result the defer directory (with one log per deferred
	message) may contain many files; also, this directory is
	accessed each time a message is let into the active queue,
	in order to delete its old defer log. This means that hashed
	directories are now a must.

19980718-20

	Feature: configurable timeout for establishing smtp
	connections.  Parameter:  smtp_connect_timeout (default 0,
	which means use the timeout as wired into the kernel).
	Inspired by code from Lamont Jones. For a clean but far
	from trivial implementation, see util/timed_connect.c

	Cleaned up the interfaces that implement read/write deadlines.
	Instead of returning -2, the routines now set errno to
	ETIMEDOUT; the readable/writable tests are now separate.

19980722

	Feature: the default indexed file type (hash, btree, dbm)
	is now configurable with the "database_type" parameter.
	The default value for this parameter is system specific.

	Feature: selectively turn on verbose logging for hosts that
	match the patterns specified via the "debug_peer_list"
	config parameter.  Syntax is like the "bad_smtp_clients"
	parameter (see global/peer_list.c). The verbose logging
	level is specified with "debug_peer_level" (default 2).

	Security: the local delivery agent no longer delivers to
	files that have execute permission enabled.

19980723

	Workarounds for Solaris 2.x UNIX-domain sockets: they lose
	data when you close them immediately after writing to them.
	This could screw up the delivery agent to queue manager
	protocol.

19980724

	Cleanup: spent most of the day cleaning up queue manager
	code that defers mail when a site or transport dies, and
	fixed a few obscure problems in the process.

19980726

	Feature: the admin can now configure what classes of problems
	result in mail to the postmaster. Configuration parameter:
	"notify_classes".  Default is backwards compatible: bounce,
	policy, protocol, resource, and software.

19980726-28

	Feature: the admin can now configure what smtp server access
	control restrictions must be applied, and in what order.
	Configuration parameters:  smtpd_client_restrictions,
	smtpd_helo_restrictions, smtpd_mail_restrictions and
	smtpd_rcpt_restrictions. Defaults are intended to be
	backwards compatible. The bad_senders and bad_clients lists
	are gone and have become db (dbm, nis, etc) maps. Files:
	smtpd/smtpd_check.c, config/main.cf.

19980729-31

	Feature: hashed queues. Rewrote parts of the mail queue
	API.  Configuration parameters: "hash_queue_names" specifies
	what queue directories will be hashed (default: the defer
	log directory), "hash_queue_depth" specifies the number of
	subdirectories used for hashing (default 2).

19980802

	Bugfix: the pipe mailer should expand command-line arguments
	with $recipient once for every recipient (producing one
	command-line argument per recipient), instead of replacing
	$recipient by of all recipients (i.e.  producing only one
	command-line argument).  This is required for compatibility
	with programs that expect to be run from sendmail, such as
	uux. Thanks to Ollivier Robert for helping me to get this
	right.

	Code cleanup: for the above, cleaned up the macro expansion
	code in dict.c and factored out the parsing into a separate
	module, mac_parse.c.

19980803

	"|command" and /file/name destinations in alias databases
	are now executed with the privileges of the database owner
	(unless root or vmailer).  Thus, with: "alias_maps =
	hash:/etc/aliases, hash:/home/majordomo/aliases", and with
	/home/majordomo/aliases* owned by the majordomo account,
	you no longer need the majordomo set-uid wrapper program,
	and you no longer need root privileges in order to install
	a new mailing list.

19980804

	Added support for the real-time blackhole list.  Example:
	"client_restrictions = permit_mynetworks, reject_maps_rbl"

	All SMTP server "reject" status codes are now configurable:
	unknown_client_reject_code, mynetworks_reject_code,
	invalid_hostname_reject_code, unknown_hostname_reject_code,
	unknown_address_reject_code, relay_domains_reject_code,
	access_map_reject_code, maps_rbl_reject_code. Default values
	are documented in the smtpd/smtpd_check.c man page.

19980806-8

	Code cleanup: after eye balling line-by line diffs, started
	deleting code that duplicated functionality because it was
	at the wrong abstraction level (smtp_trouble.c), moved
	functionality that was in the wrong place (dictionary
	reference counts in maps.c instead of dict.c), simplified
	code that was too complex (password-file structure cache)
	and fixed some code that was just wrong.

19980808

	Robustness: the number of queue manager in-core structures
	for dead hosts is limited; the limit scales with the limit
	on the number of in-core recipient structures. The idea is
	to not run out of memory under conditions of stress.

19980809

	Feature: mail to files and commands can now be restricted
	by class:  alias, forward file or include file. The default
	restrictions are:  "allow_mail_to_files = alias, forward"
	and allow_mail_to_commands = alias, forward". The idea is
	to protect against buggy mailing list managers that allow
	intruders to subscribe /file/name or "|command".

19980810-12

	Cleanup: deleted a couple hundred lines of code from the
	local delivery agent. It will never be a great program;
	sendmail compatibility is asking a severe toll.

19980814

	Cleanup: made the program shut up about some benign error
	conditions that were reported by Daniel Eisenbud.

19980814-7

	Documentation: made a start of HTML docs that describe all
	configuration parameters.

	Feature: while documenting things, added smtpd_helo_required.

19980817

	Bugfix: at startup the queue manager now updates the time
	stamps of active queue files some time into the future.
	This eliminates duplicate deliveries after "vmailer reload".

	Bugfix: the local delivery agent now applies the recipient
	delimiter after looking in the alias database, instead of
	before.

	Documentation bugfixes by Matt Shibla, Tom Limoncelli,
	Eilon Gishri.

19980819

	GLIBC fixes from Myrdraal.

	Bugfix: applied showq buffer reallocation workaround in
	the wrong place.

	Bugfix: can't use shorts in varargs lists. SunOS 4 has
	short uid_t and gid_t. pipe_command() would complain.

	Bugfix: can't use signed char in ctype macros. All ctype
	arguments are now casted to unsigned char. Thanks, Casper
	Dik.

19980820

	Bugfix: save the alias lookup result before looking up the
	owner.  The previous alpha release did this right.

	Cleanup: mail_trigger() no longer complains when the trigger
	FIFO or socket is unavailable. This change is necessary to
	shut up the sendmail mail posting program, so that it can
	be used on mail clients that mount their maildrop via NFS.

	Experiment: pickup and pipe now run as vmailer most of the
	time, and switch to user privileges only temporarily.
	Files: util/set_eugid.c global/pipe_command.c pipe/pipe.c
	pickup/pickup.c. Is this more secure/ What about someone
	manipulating such a process while not root? It still has
	ruid == 0.

19980822

	Portability: with GNU make, commands such as "(false;true)"
	and "while :; do false; done" don't fail. Workaround: use
	"set -e" all over the place.  Problem found by Jeff Wolfe.

	Feature: "check_XXX_access maptype:mapname" (XXX = client,
	helo, sender, recipient). Now you can make recipient and
	other SPAM restrictions dependent on client or sender access
	tables lookup results.

19980823

	Bugfix: smtpd access table lookup keys were case sensitive.

	Added "permit" and "reject" operators. These are useful at
	the end of SPAM restriction lists (smtpd_XXX_restrictions).

	Added a first implementation of the permit_mx_backup SPAM
	restriction. This permits mail relaying to any domain that
	lists this mail system as an MX host (including mail for
	the local machine). Thanks to Ollivier Robert for useful
	discussions.

19980824

	Bugfix: transport table lookup keys were case sensitive.  

19980825

	Portability: sa_len is some ugly #define on some SGI systems,
	so we must rename identifiers (file util/connect.c).

	Bugfix: uucp delivery errors are now sent to the sender.
	Thanks, Mark Delany.

	Bugfix: the pipe delivery agent now replaces empty sender
	by the mailer daemon address. Mark Delany, again.

	Portability: GNU getopt looks at all command-line arguments.
	Fix: insert -- into the pipe/uucp definition in master.cf.

	Bugfix: the smtp server command tokenizer silently discarded
	the [] around [text], so that HELO [x.x.x.x] was read as
	if the client had sent: HELO x.x.x.x. Thanks, Peter Bivesand.

	Bugfix: the HELO unknown hostname/bad hostname restrictions