Safe way to email newsletter to 19K users.
 

I have used Amazon SES but want to use my own email server that I set up on VPS. How would you space it out so the that IP doesn't go to spam libraries?

Send the emails at the beginning with a time delay and monitor your IP via:
https://www.spamhaus.org
Most email provider use spamhaus.

The correct DNS SPF, DKIM, DMARC settings are absolutely necessary.
Here is a good site to test your settings:
https://www.mail-tester.com


Greetings Beaver

Thank you. :thumbsup