What is a good e-mail service to send 20000 emails per month?

I need send 20000 emails per month tomy customers.



Can you please, suggest me a good email servervie for SMTP?

It does not need to be free, I can pay for it, but need the best price.What is a good e-mail service to send 20000 emails per month?
gmail.com

pdd nos

tess gerritsen