[Dovecot] relay-ctrl works

In case anyone still cares, relay-ctrl works with Dovecot. Dovecot's
end of the bargain requires a dirty little script to set TCPREMOTEIP
based on the arguments passed from imap-login:

#!/bin/sh TCPREMOTEIP=echo "$@" | sed -e 's|.* ||' -e 's|]$||' export TCPREMOTEIP exec "$@"

And this (long) line in dovecot.conf:

mail_executable: envdir /etc/relay-ctrl /usr/local/bin/relay-ctrl- chdir /usr/local/bin/dovecot-settcpremoteip /usr/local/bin/relay-ctrl- allow /usr/local/libexec/dovecot/imap

For the SMTP end of the bargain, relay-ctrl has docs for qmail-smtpd
and mailfront.