Greetings,

Why does a freshly installed CentOS 7.9 / CommuniGate Pro 6.3.11 server only gets a B grade with the Qualys SSL checker (see attached screenshot) ?

[root@mail ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@mail ~]# telnet localhost 110
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
+OK 3gnt.net CommuniGate Pro POP3 Server 6.3.11 ready

The server uses a valid SSL certificate, and if use an Apache server as a reverse proxy, I get an A grade, which makes me think it's something with the CommuniGate Pro SSL implementation. However, I feel using Apache as a reverse proxy makes no sense, since CommuniGate Pro has an embedded Web server.

How do i fix/workaround the "This server does not support Forward Secrecy with the reference browsers. Grade capped to B." problem reported by the Qualys SSL checker ?

Regards,