improve some error messages; fix quoted :include:s; check for some
other buffer overflows; log SMTP protocol errors

some (iffy) changes to prevent suppressing the actual sender
during a queue run (interaction with C line in qf file)

fix problem with address delimitor inside quotes; define $k and $=k
to be the name (from the uname call)

revert debugging to old values

fix minor debugging botch

environment handling simplification/bug fix; handle commas inside
comments; properly limit large messages in -obq mode

MX piggybacking, based on code from John Myers@CMU; allow checkcompat
to return -1 to mean tempfail; bug fix in m_mno computation

changes to recognize special mailer types (e.g., file) early

fix botch in invalidaddr() routine

check for invalid characters in addresses

Release 6

fix aliases to print error messages (rather than core dumping);
allow words as error codes to $#error mailer

try to allow host on local mailers (for some reason)

allow specification of arbitrary string on successful db match

finish support for generalized maps

(partially) ANSI-fy it

try to do some syntax error corrections on errors in headers

add some debugging info

fix a variety of small bugs noticed by bcx

hacks so it will compile -- but I don't see making a lot of use
of this version, because of the extent of the changes

version from Neil Rickert

lint

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

make eight-bit clean; backslashes are carried through as-is

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