53 Connect   mail@localhost on mail
53 Connect   Access denied for user 'mail'@'localhost' (using password: YES)
54 Connect   mail@localhost on mail
54 Connect   Access denied for user 'mail'@'localhost' (using password: YES)
55 Connect   mail@localhost on mail
55 Connect   Access denied for user 'mail'@'localhost' (using password: YES)
56 Connect   mail@localhost on mail
56 Connect   Access denied for user 'mail'@'localhost' (using password: YES)

mysql -u mail -p -h localhost

pwcheck_method: auxprop
mech_list: PLAIN LOGIN
log_level: 7
allow_plaintext: true
auxprop_plugin: sql
sql_engine: mysql
sql_hostnames: localhost
sql_user: mail
sql_passwd: [hidden]
sql_database: mail
sql_select: select password from mailbox where username='%u@%r' and active = 1

query = select 1 as found from users where email = '%u@%d' and enabled = true LIMIT 1;