when using the local enqueuer, do not hardcode "localhost" on the
Received line, we can use env->sc_hostname instead
Merge branch 'master' of https://github.com/OpenSMTPD/OpenSMTPD
import rfc2822 (Message) and rfc822 (Address) _simple_ parser
implementations that can be used on streamed input.
smtpd.h imports rfc headers
Update README.md

spotted by abbe
plug rfc2822 parser to smtp_session but do not process lines yet
feed rfc2822 parser but do not register callbacks yet
iobuf_queue() does not return len ...
all header and data lines now pass through the rfc2822 feeder
masquerade _smtp-in_ code path to fix an interop issue with other MTA
when dealing with older MUA that do not append their domain