[maildropl] maildrop + userdb: invalid recipient messages not coming back?

[Alex P. <ap...@en...>]

I have qmail set up with maildrop and maildrop using userdb for virtual
users.  If I send an email to a non existent virtual user, I see a
message like this in /var/qmail/log/current:

@400000003c5ad37805c1afac delivery 31: deferral:
/usr/local/bin/maildrop:_Invalid_user_specified./

I'm not sure if this is a maildrop issue or a qmail issue, but does
anyone know how to correct the problem so that the message is sent back
to the sender?


TIA,

--Alex