maildrop/transport issues with recipient_delimiter = - and postfix,

Hello list

I just upgraded from 2.0.19 to 2.1.1 (with debs from debian unstable)
and just noticed an issue with recipient_delimiter. I have to have
"recipient_delimiter = - " as I've migrated from qmail.

The problem is that maildrop doesn't get the full address if the left
hand side of the address contain a -, postfix seems to strip of
everything from the first - to the @.

Maildrop is called with
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/local/courier/bin/maildrop
-d ${user}@${nexthop} ${extension} ${recipient} ${user} ${nexthop}

and transport is set to maildrop: for all domains.

--niklas