I have a website, and there is a module private messages. Now everything works on pdd Yandex. I.e. if the user is registered, a notification appears.. Or change password, etc.
But I have no notifications, i.e., for example, informing the user that he received 2 messages. And so I think how to be... whether to raise your mail server (I honestly do not particularly whisking) or to settle for Yandex. Yandex I like it, but I think he may stop sending emails after a certain limit, or just deems it to be spam=(
Yandex limits like 200 emails a day from your account. Don't know, there may be separate limits for special letters of the form "notifications."
Mass notification is services like aws ses, elastic mail, and other stuff.
Amazon gives 2K emails per day for free, elastic - 5K (without attaches, of course).
Plus, these services usually work successfully with formal replies and abusali, and on my mail server it will have to do. So I for third-party services.