dovecot/rootfs/etc/confd/templates/auth-oauth2.conf.ext.tmpl

passdb {
  driver = oauth2
  mechanisms = oauthbearer xoauth2
  args = /etc/dovecot/dovecot-oauth2.token.conf.ext
}

passdb {
  driver = oauth2
  mechanisms = plain login
  args = /etc/dovecot/dovecot-oauth2.plain.conf.ext
}

userdb {
  driver = lua
  args = file=/etc/dovecot/oauth2-userdb.lua blocking=yes
}