From time to time, HostGator may block our IP addresses. We tried adding several servers, and we're having 10 servers with 10 different IP addresses now, but they keep blocking them all.
So currently we could not support HostGator users.
If you see this error message in your cronjob's output:
Access denied. Your IP address is blacklisted. If you feel this is in error please contact your hosting provider's abuse department.
This means you should either switch to another hosting provider, or use another cronjob service.