blocking - sql(acastus at example.ch,IP): unknown user

[mauric at gmx.ch]

hello

running with following Setup booster, postfix, Dovecot, mysql and meny other
nice tools

searching for solutions I see meny other running with same questions like
this,



so please what i need to read or setup that i don't receive so many failed
logon try? "unknown user"



i see, meny "fix" this fail2ban, but iam shure that Dovecot has also any
solution for this? so friendly

asking how to close this request from trying for failed logon.



May 14 time Dovecot/auth-worker(8075): Debug: Loading modules from
directory: /usr/lib/dovecot/modules/auth

May 14 time Dovecot/auth-worker(8075): Debug: Module loaded:
/usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so

May 14 time Dovecot/auth-worker(8075): Debug: Module loaded:
/usr/lib/dovecot/modules/auth/libdriver_mysql.so

May 14 time Dovecot/auth-worker(8043): Debug: sql(acastus at example.ch,IP):
query: SELECT username AS user, password, '/folder/example.ch/acastus' AS
userdb_home, '10000' AS userdb_uid, '10000' AS userdb_gid,
CONCAT('maildir:storage=', (quota*1024)) as userdb_quota FROM mailbox WHERE
username='acastus at example.ch' AND active = 1

May 14 time Dovecot/auth-worker(8026): Info: sql(acastus at example.ch,IP):
unknown user



thanks

Mauri

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