Advise paid service email-mailings.
The pro.subscribe(tariff "Professional") Is Not satisfied is not terribly user-friendly interface, the laziness and the lack of API.
— availability of API(create the messages).
— the ability to create personalized emails (Dear Elena Aleksandrovna. personalized links, etc.).
— HTML emails.
— The volume of mailings — 3 emails per month at its user base(100 000), i.e. somewhere 300 000 emails per month.
cost about 10 000 rubles\\month.