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

[Aki Tuomi]

> On 19/05/2021 17:38 maurizio at caloro.ch wrote:
> 
> 
> Please ?
> 
> Von:dovecot <dovecot-bounces at dovecot.org> Im Auftrag vonmauric at gmx.ch
> Gesendet: Freitag, 14. Mai 2021 15:16
> An: dovecot at dovecot.org
> Betreff: blocking - sql(acastus at example.ch,IP): unknown user
> 
> 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

Hi!

You can try auth_policy_server such as weakforced. See https://github.com/PowerDNS/weakforced and https://doc.dovecot.org/configuration_manual/authentication/auth_policy/#authentication-auth-policy

Aki