Something

base_dir = /var/run/dovecot/
protocols = imap pop3 imaps pop3s
ssl_disable = no
ssl_cert_file = /etc/ssl/server.crt
ssl_key_file = /etc/ssl/server.key
ssl_parameters_file = /var/run/dovecot/ssl-parameters.dat
ssl_parameters_regenerate = 24
log_path = /var/log/dovecot
info_log_path = /var/log/dovecot.info
login_dir = /var/run/dovecot/login
login_chroot = yes
login = imap
login_executable = /usr/lib/dovecot/imap-login
login_user = dovecot
login = pop3
login_executable = /usr/lib/dovecot/pop3-login
verbose_ssl = yes
valid_chroot_dirs = /var/spool/vmail
default_mail_env = maildir:/var/spool/vmail/%d/%n
imap_executable = /usr/lib/dovecot/imap
pop3_executable = /usr/lib/dovecot/pop3
auth = default
auth_mechanisms = plain digest-md5
auth_userdb = passwd-file /etc/dovecot/users
auth_passdb = passwd-file /etc/dovecot/passwd
auth_executable = /usr/lib/dovecot/dovecot-auth
auth_user = root
auth_verbose = yes