StartTLS log issues

[Johannes Eckhardt]

Hi,

I'm using cyrus-imap version 2.4.17. StartTLS is configured and working 
but I often see the following messages in my logfiles:

starttls: TLSv1.2 with cipher AES128-SHA256 (128/128 bits new) no 
authentication
starttls: TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits 
new) no authentication

Can anyboy tell me what that means? Am I missing something in my 
configuration?

Best,

Johannes