move #include <sys/stat.h> into conf.h

use FileMailer instead of ProgMailer

fix misinterpretation of ctladdr when it goes through the queue;
this causes the setuid bit on files to be ignored

improve error printing (changes format of C line in qf)

fixes to handle null messages -- why did this break?

add e_bodytype and B queue line and -B flag for body type information

IDENT cleanup; move loopback checking from srvr to user smtp

free work queue entry even if skipping the job

fixes to properly compute priority, nrcpts, etc. on requeued delivery

do immediate requeue if expanding aliases during queue run (from SMTP)

always do sendall, even if errors in queue file; save qf name properly

don't abort an entire queue run after a single locked file

hooks for eventual better handling of SMTP recipients

catch "unable to create locked temp file" condition

keep c0 static, otherwise it is undefined if no pid change

include a warning timeout after some interval; get rid of QueueRun
global and put it in the envelope; some other minor bug fixes

move SendMode and ErrorMode into the envelope

check for error writing queue control files

avoid extra unnecessary creation of queue files solely for an
unneeded id

glitch on queue printing

accept old-format queue files

add one more letter to queue names to encode the hour; this makes
queue ids more likely to be unique during any particular day

restore e_sender as sending address sans decorations

flock requires sys/file.h

attempts to handle ENFILE conditions better