Depending on how many different SMS recipients you are sending to, you can send them via the carrier provided service.
For example, I send SMS to myself and my wife often via outlook email using their carrier provided email to SMS address. This is simple since I know our carriers.
You can google "email to sms verizon tmobile etc..." to get carrier specific connector addresses. Example: [email protected]
Here is a list of some carriers and their SMS/MMS gateway domains: https://www.digitaltrends.com/mobile/how-to-send-e-mail-to-sms-text/
If I were sending to many people, this may not be a good solution. I have used this well for server alerting to a small group of team members via sms, or sending a reminders to myself or wife.