I notice from that link your blacklist check page doesn't load .
I'm not a business but have several hobbyist websites which will send notification emails via my websites hosting panel. According to the Email settings in cPanel the SPF / DKIM / PTR etc are all valid.
My host says "Email you are sending is triggering the spam filter at your email provider's (btinternet.com) end. From what I can see the emails are working properly from our end."
So where do I go from here?
