reduce number of instances of CurEnv by passing it as a parameter

security hacks: make F .cf line a little more careful; don't
close more than 256 files

open connection caching

allow configuration of GECOS matching; do regular aliasing after
a GECOS match

add generalized database mapping (using the K config line and
$( ... $) syntaxes); $[ ... $] is now a special case

make C option safe; output values of $r and $s macros to qf; allow
long messages in queue files

reject connections more quickly if load average goes up;
try to time out on opens of .forward files on hung filesystems

allow on-line comments; don't double-parse RCPT To: addresses;
warn on truncated lines; do some sanity checks on .cf file descriptor

add new 'V' config line to control configuration syntax version

from Bryan Costales: several smallish changes, mostly to clean
up debugging output. The major change is that test mode (-bt)
doesn't automatically run through ruleset three any more.

allow limited 8-bit support; allow [TCP] as an alias for [IPC], even
though it's wrong; restore t option for System V support; add L=_N_
mailer option for line lengths; implement R mailer flag to get

allow limited 8-bit support; allow [TCP] as an alias for [IPC], even
though it's wrong; restore t option for System V support; add L=_N_
mailer option for line lengths; implement R mailer flag to get
restricted port; misc cleanup

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allow F config line to open a pipe

fixes for user database and new config files

add "config level" config parameter

some changes to enhance compatibility with SunOS sendmail

reverse sense of w (wildcard MX) flag to default to the safest option,
instead of the most desirable option.

fix some debugging output

hooks for distributed user database system

some compatibility with SunOS for future work here at Berkeley;
change NO_WILDCARD_MX compilation flag to configuration option "w".

k option specifies checkpoint interval (default 10);
qf file is rewritten after k successful deliveries.
(ref bug 4.3BSD-reno/usr.bin/10)

new copyright notice

sendmail security problems; bug report 4.3BSD/usr.lib/153
sendmail security problems; bug report 4.3BSD/usr.lib/133
sendmail security problems; bug report 4.3BSD/usr.lib/136

add missing () to test in if statement to correctly accept -oM[rs]

allow -oMr and -oMs; rmail wishes to set them

remove DEBUG