remove special "at" processing (experimental)

drop M_FINAL, change some other defined constant names

clean up some header information; don't reopen tempfile as
stdin (to fix some problems with saving mail on interrupts)

totally rework aliasing scheme -- sucks when no DBM now,
but works better for the usual case; fix some quoting problems
(and how many did I add?); remove .mailer feature since .forward
will simulate

totally rework aliasing scheme -- sucks when no DBM now,
but works better for the usual case; fix some quoting problems
(and how many did I add?); remove .mailer feature since .forward
will simulate this happily

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lint it

add private incoming mailers; add q_home field to ADDRESS struct;
some general cleanup

add another set of rewrite rules to process From: address;
this will allow generalized from address processing in an
internet

add word classes

fix funny botch in $o exclusion

put word delimiters into cf file

change name (again); from postbox to sendmail

merge letters to the same host into one message

general cleanup, esp. macro processor

fix botch in string compares

first step at rewriting rules, etc.

do host equivalence

change q_mailer to be index, not pointer

lint fixes

save real mailer

----- delivermail ==> postbox -----

fixed botch in at => @ translation

fix problem with "isspace" on non-ascii characters

disallowed multiple <> spec

turn <lwsp> (spaces) into quoted '.' instead of nothing (for CMU)

release 2