location of open-smtp

[Mate Wierdl]

Kind'a answering my own question: open-smtp is always put in
~vpopmail/etc.  Indeed, configure.in has

open_smtp_cur="$vpopmaildir/etc/open-smtp"
open_smtp_tmp="$vpopmaildir/etc/open-smtp.tmp"
open_smtp_lok="$vpopmaildir/etc/open-smtp.lock"

Mate