fix -e compat flag; a few compilation warnings; improve error messages

add clean: rule

more environment problems; limit resource exhaustion; fix incorrect
name in Connection timed out message; ANSI C fixes; log message sender on
returned mail during queue run; count recipients properly

more environment problems; limit resource exhaustion; fix incorrect
name in Connection timed out message; ANSI C fixes; log message sender on
returned mail during queue run; count recipients properly; fix YP code;
diagnose "message timed out" properly

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

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

put getmxrr on NAMED_BIND

should probably lock keyed databases when reading

implement arpatounix; log more info; allow nested $?...$|...$.;
POSIX compatibility; handle SMTP MAIL command errors properly;
do early diagnosis of .cf errors; adjust checkpointing; misc bugs

add e_nsent

revert debugging to old values

fix minor debugging botch

fix compilation problem with -DNDBM only

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

eliminate UserEnviron

jgm+@CMU.EDU: check mtime of thaw file against .cf and sendmail binary

change checkcompat() to return an exit status

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

add host signature STAB class

let checkcompat return -1 to indicate temporary failure

tuning of queueing functions as recommended by John Gardiner Myers
<jgm+@CMU.EDU>; return mail headers (no body) on messages with negative
precedence; minor other bug fixes

make some ints into longs

add map.o

describe Makefile differences

fix botch causing queued headers to have ?XX? prefixes

fix botch causing queued headers to have ?XX? prefixes