Edit File: auth-deny.conf.ext
# Deny access for users. Included from 10-auth.conf. # Users can be (temporarily) disabled by adding a passdb with deny=yes. # If the user is found from that database, authentication will fail. # The deny passdb should always be specified before others, so it gets # checked first. # Example deny passdb using passwd-file. You can use any passdb though. passdb { driver = passwd-file deny = yes # File contains a list of usernames, one per line args = /etc/dovecot/deny-users }