Mailing service

Question

Email

People, but tell me a couple of services to send mail to a huge audience of the project. Our mail servers can no longer cope. Yes, and we decided that it's easier to give them to something more necessary)
Basic requirements:
1) Letters should not be marked as spam. Those. the service should be able to unsubscribe people on request, be well-configured, etc.
2) No advertising of the service in the letter.
3) Ability to substitute From and Reply-to

Answer 1

www.mailchimp.com/

Answer 2

What are you sending via mail()? Try swiftmailer.org/ for php.

Answer 3

www.smtp.com/ru/ - may be suitable

Answer 4

sendgrid.com/postmarkapp.com/
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Answer 5

Here is all this my-office24.ru