We are running a Zimbra 8.6.0 mail server on an Ubuntu box. In mail log I am seeing some Anonymous TLS connection made to our server mail server.Is this something I should be worried.
Jun 11 12:14:15 mail postfix/smtpd[2963]: Anonymous TLS connection established from p3plsmtpout004.prod.phx3.secureserver.net[208.109.80.1]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)