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

passdb {
  driver = oauth2
  mechanisms = oauthbearer xoauth2
  args = /etc/dovecot/dovecot-oauth2.token.conf.ext
  skip = never
}

passdb {
  driver = oauth2
  mechanisms = plain login
  args = /etc/dovecot/dovecot-oauth2.plain.conf.ext
  skip = never
}

userdb {
  driver = static
  args = uid=vmail gid=vmail home=/var/lib/vmail/mail/%n
}