ARBPTR_T

fix botch with EXPN continuation lines

more 4.3 changes

old 4.3BSD changes

portability for Sony NEWS workstations

updates for Convex, NEWS-OS 4.1C (Sony), and UNIOS-B 1.6 (Omron)

RISCOS and SGI fixes; fix error handling (caused error messages to
be discarded in some circumstances)

more portability changes, including ConvexOS support

further compat changes for Solaris & other System-V derived systems

fix duplicate diagnosis of aliasing/forwarding loop broken

SGI IRIX & ANSI C portability

include M flag on Ultrix for DECnet compatibility

FallBackMX wasn't properly supressed if it pointed to yourself

HASSETEUID => HASSETREUID and changes to avoid having to do
setuid(getuid()) in main.

write command line information in pid file

document -X flag

4.4BSD snapshot (revision 8.1); add 1993 to copyright

make metamac.metaval type u_char (some compilers complain)

clean up semantics: QDONTSEND says don't ever send, and diables QQUEUEUP
(previously, it meant don't send in this run)

more information to help identify the error cause

have "Unbalanced" messages note that the problem was fixed

don't announce qf name to srvrsmtp-generated queue runs; don't create
a bogus q_alias on queue runs (this causes error messages to act differently
between regular and queue runs).

better error message handling: don't create bogus return messages;
print both actual address and q_alias whereever possible

allow 6xx codes to mean "warnings sent to postmaster"

detect self-destructing alias loop more generally for better diagnostics