I have turned off mail notifications and any other mail going out for the time being. We are doing some troubleshooting on the server and I needed to do this.
Thank you for you patience.
As of this weekend, it appears that you have got the email notifications going again both for private messages and updates to subscribed threads -- hooray! The only issue I have currently is that my ISP is flagging them all as possible "SPAM:" because the subject line is blank. Thanks for your efforts, and keep up the good work! (Easy for me to say... :) )
What is an SSL certificate? I got the error on my computer too. Do all websites have or need these?