Originally Posted by falko
Ok, you have all your data in a MySQL database, so you should check the MySQL database if there's some problem with the data (aliases, transports, etc.) that causes your problem.
The MySQL database seems fine. All of the data seems fine, and if manually run queries based on those that postfix is using (to get transport, aliases, and remote_aliases, they all return data ok.
And as the mail server has been handling email perfectly ok for 1 person in the "to" field, then the database seems to be fine.
Maybe its something else?
Amavis, or maildrop?