vesta/install/debian/7/dovecot/conf.d/auth-passwdfile.conf.ext

passdb {
  driver = passwd-file
  args = scheme=MD5-CRYPT username_format=%n /etc/exim4/domains/%d/passwd
}

userdb {
  driver = passwd-file
  args = username_format=%n /etc/exim4/domains/%d/passwd
}