Especially as the default 'deliver' does flock() locking, the default 'qpopper'
does fcntl() locking (flock() but with a flock.c which really does fcntl())
and the net result is large amounts of mail bounces which sendmail doesn't
handle well and bounces a whole mass of messages when it sees the first
error. So yes, Debian users should compile their own deliver and/or qpopper
and/or other mail programs. This is one area Debian is currently lacking -
there's no "Debian mail locking standard" evident.
Debian's 'deliver' also doesn't send comsat ("biff") messages. I have a patch
if anyone's interested and able to get it into 'deliver', since all addresses
in the source code end up in mail bounces.
Oh, and the person I could never contact re: deliver since the e-mail addresses
in the source code all bounce...
...hello, there :-) I'll send you the patch to send messages to comsat if
you'd be interested, it's a change to mbox.c in deliver-2.1.13.
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