[Yankeeman07]

Just learned about phpList.
If you are using a cpanel-based server, which I recommend namecheap.com highly (although GoDaddy can do this also, I do NOT recommend them), then you can install it through Softaculous and it was incredibly intuitive to figure out, and completely free, unlike dedicated Linux servers.

183 emails sent in 4.56 seconds from when I finished the email.

This is roughly 5 emails per second, depending on the size of the email.

MAYBE if you had direct access to OC3 - email could be delivered at that speed and you would need multiple ports open at the same time.

https://smallbusiness.chron.com/oc3-...ogy-58490.html