user = db_mailuser
password = mailuser_password
hosts = 127.0.0.1
dbname = mailserver
query = SELCET email FROM virtual_users WHERE email='%s'

postmap -q email@some.domain mysql:/etc/postfix/mysql-email2email.cf

postmap: warning: mysql query failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELCET email FROM virtual_users WHERE email='email@some.domain'' at line 1

mysql> SELECT email FROM virtual_users WHERE email='email@some.domain'

+-------------------------+
| email                   |
+-------------------------+
| email@some.domain       |
+-------------------------+
1 row in set (0.00 sec)