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Yours is the exact use case that it covers super well.

Pay a one-time ~$60 fee and runs on top of SES.

You can now also use most other SMTP services like Postmark, SMTP2go, Elastic Email, Sendgrid or Mailjet as of v6.0.1.1

Sweet!

This is a good one. Since it's written in PHP, deployment is a breeze as well. Highly recommended.