[pititis]

Hi Ian

In master.cf you have:

maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=daemon:mail argv=/usr/bin/maildrop -d ${recipient}

Try this:

maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d vmail ${extension} ${recipient} ${user} ${nexthop} ${sender}