Programs for organizing e-mail newsletters from a MacBook?

Question

macOS

Hello dear users!
Could you recommend mass mailing software for MacOS X (I'm on 10.9.5)?
Maybe someone has links to fresh reviews of such programs - paid and free?
And another question: I have my own business for daily rent in Novosibirsk - so, I faced the need to make such mailings. In your opinion, what is better (cheaper and more efficient) - to contact specialized services or do everything yourself? Letters are supposed to be sent to all of Russia, plus, possibly, Kazakhstan and Belarus.

Answer 1

Russian equivalent of mailchimp -> unisender.com

Answer 2

mailchimp.com use yes and that's it, there is a web interface

Answer 3

Thank you! Can you recommend programs?