Hello I'm having this problem thats really doing my brain in. Basically when someone register they don't receive a confirmation email. I have tried different settings, both SSL and TSL and non encrypted. Look at screen shot:
Are people just not receiving the registration emails, or are they not receiving other emails as well, i.e. when PMs are delivered, updates to threads, etc.? Also, is it just for some people, or is nobody at all receiving the mails?
You're hosted with ColoCrossing (or one of their resellers) and they are infamous for being on spam blacklists and harboring spammers. In fact, they were one of the top in the world at one point. Even though they cleaned up their act considerably, many providers still blacklist their entire IP address space. As far as blacklists are concerned, your IP address is currently on several blacklists. Could be the issue as well, assuming everything is working on the server. Have you checked your exim/mail logs (if you have access) to see what's going on?
Yes...because your server IP is blacklisted on at least 6 or 7 blacklists. They aren't really the major ones, like Spamhaus and such, but they're blacklisted nonetheless.
As far as Hotmail, it's not just a "lately" thing. They have been militant about their emails for years. Even if you're on no blacklists, Hotmail always seems to blacklist your server. The funny thing is, I receive more spam on my old Hotmail account than all my other email accounts combined. So all the good their blocking is doing...