todo

linux下qmail的源码 本人加了一些注释

consider stripping vdoms for VERPs; tnx PJH
consider ~ in qmail-local for doing defaultdelivery (not recursively)
consider POP bulletins
turn qmail-upq into a more serious queue-moving utility
consider fast-greeting option in qmail-smtpd
build a returnmail package

expand strerr coverage
redo control interface
allow concurrency over 255
allow more channels at compile time
test for linux fifo close bug at compile time

eliminate qsmhook
finish OTBS conversion
use mess822 in qmail-inject
use mess822 in qreceipt
use mess822 in qbiff
use mess822 in maildirwatch
eliminate token822, headerbody, hfield
replace INTERNALS and THOUGHTS with a real paper describing qmail
handle IPv6
rewrite everything from scratch