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Hello, @arteguiavale2
You can spin up an Ubuntu droplet and then install PostFix on it. You can check your tutorial on How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 20.04
I’ll also recommend you to check this article before taking any action.
https://www.digitalocean.com/community/tutorials/why-you-may-not-want-to-run-your-own-mail-server
Hope that this helps Regards, Alex