If you are running local applications, internal microservices, or custom scripts, you often just need a simple way to send email notifications without configuring a bloated, traditional Mail Transfer Agent (MTA) like Postfix. That is why I created ZeroSMTP – a lightweight, open-source SMTP relay...
Source: [Dev.to](https://dev.to/wizard_0ac4371d77f3efd763/how-to-set-up-a-lightweight-smtp-relay-for-your-apps-in-seconds-32l1)