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I am running a registration website where users receive email confirmation after successful registrations. About 4000 registrations/emails per year. Only after real "human" registration is submitted, a confirmation email goes out. I receive 0 spam/bot registrations. Nowhere on my site you will find a page where anyone can just enter email address and receive email without email and "human" verification. I have a Business Plan from HostGator and a dedicated IP address. I am using swiftmailer, and I had been using it for years with no issues until now. Emails are send from email address under my domain (confirmation@my_domain.com) and not through third party email client. On Dec, 1st 2015 I have gotten first email bounce stating that my IP in on Spamhaus list. I did some research and found that my HostGator account did not have SPF enabled, so I enabled it (DKIM was on). I have removed the IP address from the Spamhaus list, but 12 days later I got another bounced email and I am on the list again. CBL utility states: "It (IP) shows signs of being infected with a spam sending trojan, malicious link or some other form of botnet. This IP is infected (or NATting for a computer that is infected) with the kelihos spambot. In other words, it's participating in a botnet." I am not sure what to do about this as this is a web hosting server. All the results I got in regards to " kelihos" were related to business network, and individual computers being compromised. Any ideas on how I can go about fixing this would be appreciated. I am relatively new at all this, so use small words Thanks -Peter