How to get a list of all members in Telegram?

Question

Communities

What is the easiest way to get a list of all community members in Telegram using the API?
Needed for mass mailing. Actually having received phone numbers, you can do the mailing and not with the help of a telegram.
A bot will be developed that will work with some of these participants.
Actually in the list of 3000+ members

Answer 1

You cannot receive numbers until the user agrees to this.