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If we want our servers to email, we know that we should install sendmail or qmail. If we want our servers to send SMS or robot calling (e.g voice confirmation [insecure method] ), what should we install on our servers?

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Your subject says "servers", but your question is about clients. I'll answer the question in the body. Two alternatives:

  1. Twilio

    Twilio is a platform that provides a wide range of tools to make it easy to integrate voice and SMS with your web app.

    I had good success recently with their PHP Quickstart guide (which you can test for free with a trial account) to send SMS to a phone.

  2. Directly email SMS gateway

    Also remember that if you're just trying to send a SMS to a small set of phone numbers that you know provider for, you can just email the provider's SMS gateway directly

ckhan
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