Hi Aleksandr,
thank you for your replay! telnet connections are not possible at all, because the server did not response any more. But I get this messages:
mail.err:
Apr 9 10:16:07 www dmarc[1920]: DMARC: PASS message for
[email protected]
Apr 9 10:16:07 www dk_check[1921]: DKIM verify result...