Hello,
I setup a mail marketing app like interspire , mailwizz etcc and from there you can send mails in bulk as you want.
No need to purchase anything i have some nulled version mailing app we can use it withour any pay and if you want a paid service then sendy or mailwizz is best option.
I have more than 4 years experience in bulk mailing, email marketing, Power MTA ,Interspire, mailwizz, sendy, aws ses and Oempro mailing application with secured server set up.