On 19/05/2021 17:38 maurizio@caloro.ch wrote:

Please ?

Von:dovecot <dovecot-bounces@dovecot.org> Im Auftrag vonmauric@gmx.ch Gesendet: Freitag, 14. Mai 2021 15:16 An: dovecot@dovecot.org Betreff: blocking - sql(acastus@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@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@example.ch' AND active = 1 May 14 time Dovecot/auth-worker(8026): Info: sql(acastus@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/#aut...

Aki