[Dovecot] auth mechanisem and postfixadmin

[xrado]

Aug 29 20:58:01 example dovecot: auth(default): client in: 
AUTH^I2^IPLAIN^Iservice=IMAP^Isecured^Ilip=127.0.0.1^Irip=127.0.0.1^Iresp=AHJhZG9AZXhhbXBsZS5jb20AcmFkbw== 

Aug 29 20:58:01 example dovecot: auth-worker(default): 
sql(rado at example.com,127.0.0.1): query: SELECT password FROM mailbox 
WHERE username = 'rado at example.com'
Aug 29 20:58:01 example dovecot: auth-worker(default): 
sql(rado at example.com,127.0.0.1): Password mismatch
Aug 29 20:58:01 example dovecot: auth-worker(default): 
sql(rado at example.com,127.0.0.1): PLAIN(rado) != 
'$1$997b1881$fpU1U5wRtWfVZQqbat0km/'
Aug 29 20:58:03 example dovecot: auth(default): client out: 
FAIL^I2^Iuser=rado at example.com
Aug 29 20:58:08 example dovecot: imap-login: Aborted login: 
user=<rado at example.com>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, 
secured

which mechanisem do i have to use, database uses md5crypt-ed passwords

rado.