Mine

base_dir = /var/run/dovecot/

protocols = imap imaps

disable_plaintext_auth = no

ssl_disable = no

ssl_cert_file = /etc/ssl/certs/dovecot.pem
ssl_key_file = /etc/ssl/private/dovecot.pem

login_chroot = yes

login_user = dovecot

valid_chroot_dirs = /var/spool/vmail
default_mail_env = maildir:/var/spool/vmail/%d/%n


# Grant access to these extra groups for mail processes. Typical use would be
# to give "mail" group write access to /var/mail to be able to create dotlocks.
mail_extra_groups = mail vmail
  
##
## LDA specific settings
##

protocol lda {
  # Address to use when sending rejection mails.
  postmaster_address = admin@mydomain.com

}

##
## dovecot-lda specific settings
##

auth default {
  # Space separated list of wanted authentication mechanisms:
  #   plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi
  mechanisms = plain login

  auth_verbose = yes
  user = root
userdb sql {
    # example
    args = /etc/dovecot/dovecot-mysql.conf
  }
passdb sql {
    # example
    args = /etc/dovecot/dovecot-mysql.conf
  }

}

dict {
  #quota = mysql:/etc/dovecot-dict-quota.conf 
}