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I am on the HostGator Level 5 VPS, which had the CPU: 2.69 GHZ, RAM: 1824 MB
I sent a email campaign last night to about 30,000 subscribers, while sending the email my server crashed. When I asked HostGator Support they told me that my CPU is fully utilized which is the main reason for the crash.
Can you let me know, what can I do to make sure that the server doesn't get crashed. I can do the server upgrade but still, I am not sure whether this issue will resolve or not even after the upgrade.
Do let me know the best possible thing to do in that case.
This means your server aren't powerful enough to support sending this amount of emails using mult-threading.
All you need to do is upgrade your server.