You can not test maildrop like that, so its ok that your test failed.
To your original problem. Debian has two maildrop packages, one with mysql support and a second one without maildrop support. It seems as if you replaced the maildrop on your system with the one without mysql support, this results in the problem that myaildrop can not lookup the maildir anymore in mysql and so the delivery fails. You should reinstall the original maildrop package that is used in the perfect server guide.
Last edited by till; 25th January 2010 at 18:27.
Reason: corrected some nonsense, mixed up mysql with myidrop. Do not start to write posts before you finished your cup of coffee :)