back out attempt to use flock in the queue -- we don't in gerneral have
an open file descriptor available.

Try to use flock call (this doesn't work because we don't always have an
open fd); security and performance fixes from Kirk Smith at Purdue; "a"
option is now the number of minutes to wait for "@:@"

Try to use flock call (this doesn't work because we don't always have an
open fd); security and performance fixes from Kirk Smith at Purdue; "a"
option is now the number of minutes to wait for "@:@" alias; fix bug in
$[ $] using -t; random cleanup

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assorted optimizations (no functional changes)

fix multiline aliases

fix hostname mapping to be repeatable (as required by some .cf files).

Add $[ and $] as RHS operators to look up the contents and pass them
to maphostname; maphostname currently looks them up in /etc/hosts and
converts them to canonical form, but could be turned into a

Add $[ and $] as RHS operators to look up the contents and pass them
to maphostname; maphostname currently looks them up in /etc/hosts and
converts them to canonical form, but could be turned into a general
name server..... huzzah!!

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changes from Tom Ferrin <ucsfcgl!tef>: don't drop messages on the floor
if no local mailer available; give real "errno" message in syserr.

Assorted changes from Guy Harris <rlgvax!guy>: mostly lint & USG

don't add ".ARPA" (or whatever net name) to names that already have
a dot in them; pull NetName out of initialized data space so that
it can be changed in frozen configuration files

Changes from Greg Couch <ucsfcgl!gregc> for V7 compatibility and
miscellaneous bug fixes; "clear" => "bzero" and "bmove" => "bcopy"
throughout for consistency; bzero is now in bcopy.c (these are
supp

Changes from Greg Couch <ucsfcgl!gregc> for V7 compatibility and
miscellaneous bug fixes; "clear" => "bzero" and "bmove" => "bcopy"
throughout for consistency; bzero is now in bcopy.c (these are
supplied by libc on 4.2bsd)

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fixes from Liudvikas Bukys <bukys@rochester.ARPA>:
allow -M flag to be used more than once;
handle hosts where "gethostname" does not return the canonical name.

add E mailer flag to > escape From lines (for files)

add B option to set blank substitution character

alway reset uid and gid immediately if alternate config file

remove .mailcf hack -- it's been abused.

change "returnto" to "returnq" for PDP-11 compilers

always fold case on host names; fold case on the LHS of aliases

fix argument to gethostname left over from some old interface....

disable UPPER->lower case mapping in RHS's of aliases so that upper
case letters can be used in file names and as args to programs.

changes from Bill Nowicki <nowicki@diablo.ARPA> to avoid sending
errors if a connection is aborted;
changes from Greg Katz <katz@sri-tsc> to help with PDP-11 versions;
allow home network name to be c

changes from Bill Nowicki <nowicki@diablo.ARPA> to avoid sending
errors if a connection is aborted;
changes from Greg Katz <katz@sri-tsc> to help with PDP-11 versions;
allow home network name to be changed;
change macro expansion character from $ to \001 so that $'s can be
used in headers (.cf unchanged).

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don't close files immediately before exec of mailer so that we can log;
use FIOCLEX instead. Suggested by Tom Ferrin, UCSF CGL.

fix bug with un-DBM'ed alias files that adds a newline on the end of
the last entry in the alias; found by John Gilmore, SMI

fix SERIOUS bug allowing anyone to be "wiz" without a password
if the configuration was frozen

Fixes two nasty problems, both pointed out by Bill Nowicki at Stanford:
I/O errors on input in collect would cause infinite loops, and a protocol
error (or other error that would call smtpquit abnorm

Fixes two nasty problems, both pointed out by Bill Nowicki at Stanford:
I/O errors on input in collect would cause infinite loops, and a protocol
error (or other error that would call smtpquit abnormally) would cause
core dumps

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Be able to override the hostname in the configuration file when frozen