Are there universal notification services for different (email, sms, whatsapp) channels?

Question

Notifications

How to notify a motley audience (a hundred or more people) who want to be notified, but do not want to strain and "oh, I'm a humanist"? That is, the options "set yourself a telegram" or "all get emails and check them at least once every three days" will not work. Here from the last - a community of summer residents from one society. For some, the only way to get through is texting.
No option, say, with a telegram or a VK group is suitable, since someone does not have a telegram / VK (or there is, but it starts / enters once every hundred years).
We need something where people could register, indicate their notification channel (whatsapp to someone, SMS to someone, email to someone), then the admin sends a message (for example, with a link to the full text of the news) and each receives it in the way that is convenient for him and which he follows.
Or in other words, something similar - a gate service in all ways. So that, for example, a person starts a mailbox on the service, and receives notifications of new mail in a way convenient for him (SMS, email to another address, whatsapp message, etc.). Accordingly, the admin simply sends emails, but through the gate, those who in this service-gate will also receive their account in whatsapp/telegram/VK/... indicated.

Answer 1

Connect services (sms, etc.) of mailing lists to the site and give users the choice of a mailing channel
. Votsap is not and will not be seen in the near future
Without hemorrhoids available: VK / Telegram / SMS / mail / viber / skype / facebook

Answer 2

Use PushAll
There are native web push notifications, native notifications for Android and iOS, Email notifications, telegrams.

Answer 3

If you use direct delivery channels, then WhatsApp will not suit you, there is no official distribution channel for it.
I use the sms-ka.net service, my main mailing goes through Viber, and for those who do not have it installed, an alternative text is sent by a simple SMS message to the phone. I think you can also pick up an e-mail here