Cheapest Way to Send Unlimited Email to 300k+ users?

Use a solution that allows you to send from multiple Gmail accounts and proxies.
 
cheapest is always self host your mail server
2nd is Amazon SES 100k =10$ , 300k = 30$
3rd others ...
 
Amazon Simple Email Service. Try using it with Mautic or Sendy Softwares.
 
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