Hi, to prevent mail client (Outlook, Opera Mail etc) keep aksing to verify self signed SSL Cert should I use proprietary SSL certificate ? Is Comodo Positive SSL (cheapest SSL) is enough to prevent mail client keep asking to verify SSL ? How about FREE StartSSL cert ? Is it also could prevent mail client keep asking to verify SSL ? I know this is not related to ISPconfig matters but I cannot find answers from anywhere. Thank you.