I am attempting to send to a list of around 60,000 email addresses. We recently moved to a dedicated server at HostGator and they say there are no limitations. We are using a Cloud Based SMTP server to send and I have the system able to send unlimited messages per hour. However, it never seems to be able to send more than 4,000 to 6,000 per hour. My old system at Dreamhost reach 12k to 15k per hour so this should be able to do the same. Is there a setting I haven’t found that limits the number of messages per hour?
My latest change was to run the CRON job hourly with a length of 55 minutes to send an unlimited number of messages but still not working. Your assistance would be much appreciated.