Edit File: auth-checkpassword.conf.ext
# Authentication for checkpassword users. Included from 10-auth.conf. # # <doc/wiki/AuthDatabase.CheckPassword.txt> passdb { driver = checkpassword args = /usr/bin/checkpassword } # passdb lookup should return also userdb info userdb { driver = prefetch } # Standard checkpassword doesn't support direct userdb lookups. # If you need checkpassword userdb, the checkpassword must support # Dovecot-specific extensions. #userdb { # driver = checkpassword # args = /usr/bin/checkpassword #}