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# MAIL.RU #
#####################################################################################################################################

# domains that resolve to MAIL.RU
domain-macro mailru mail.ru,bk.ru,inbox.ru,list.ru,mail.ua,mail.kz

<domain $mailru>
  use-starttls no
  max-smtp-out 2                                                  # default be nice on concurrent connections
  max-msg-per-connection 10                                       # max 500 mails in one session
  max-rcpt-per-message 10
  max-errors-per-connection 10                                    # avoid 'too long without data command' error
  reuse-ssl-session no

  max-msg-rate 16/m

  bounce-upon-no-mx yes                                           # proper mail domains should have mx
  assume-delivery-upon-data-termination-timeout yes               # avoid duplicate deliveries
  smtp-421-means-mx-unavailable yes
  smtp-553-means-invalid-mailbox yes
  bounce-upon-5xx-greeting true
  connect-timeout 1m
  smtp-greeting-timeout 5m
  data-send-timeout 5m
  retry-after 30m                                                 # typical greylisting period
  bounce-after 3d                                                 # default 4d12h

  smtp-pattern-list blocking-errors
  backoff-max-msg-rate 20/h                                        # send only regular tries during backoff (default unlimited)
  backoff-retry-after 1h,3h,6h,12h                                # retry at least every 20m (default 1h)
  backoff-to-normal-after-delivery yes                            # revert to normal asap (default no)
  backoff-to-normal-after 1h                                      # always revert to normal after 1h (default never)

  dk-sign yes
  dkim-sign yes
  deliver-local-dsn no
</domain>