I'm getting an error message about certificates

I get a message from emClient that says they can’t verify the identity of mediacombb.net. What am I supposed to do with this error message?

What is the exact certificate line entry you are importing ? Can you paste it in this thread.

Also what version of eM Client are you running, and do you have Windows or Mac.

It says a whole bunch of stuff that it won’t let me copy and paste. Here is some of it:

emClient can’t verify identity of “mail.mediacombb.net
The host name doesn’t match the name specified in the certificate.
You might be connecting to a server that is pretending to be
mail.mediacombb.net” which could put your confidential information
at risk. Would you like to connect to the server anyway?

It says after that a bunch of gobblygook.

My OS is Windows 8.1 and version of emClient is 8.2.1659

I don’t know anything about certificates or why this box is appearing.