How to organize automated mailing of telegrams?

The problem is this:

Need a newsletter on the likeness of that which happens by e-mail
1. The subscriber noted in the telegrams
2. In response, it comes the file (the Lead Magnet)
3. Periodically he receives automatic messages (pre-cooked)

Prompt a software, bot or technology to implement
June 14th 19 at 21:00

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