Error with Kmail no TLS accepted

Hello to everybody, I use kmail trinity. On a domain name (server) working with postfix and dovecot, I have this configuration : Port 995, mode TLS. Kmail detects automatically this configuration : Port 110, mode TLS I receive this message : "Impossible to connect to host. Your POP3 server claims to support TLS but negotiation was unsuccessful". port 110 or 995. It works only with no certificates (100% clear). It's strange, because with the MUA Icedove, it works perfectly, port 995 and TLS. Does the problem come from Kmail ? Thank for your answers. and Have a good day, André