Currently, Bubble only supports SendGrid as a native integration for the Send Email action. That said, popular alternative email services like Postmark or SendinBlue can be integrated using either third party plugins or a custom integration via our API Connector.
We also recommend checking out the Bubble Forum for posts where users shared their experience using alternative email services.
Here are links to some posts that can be helpful:
Setting up Postmark: Postmark is awesome
Setting up Inbound emails using Postmark: How to set up Inbound Emailing with Postmark’s Inbound Processing
Setting up SendinBlue: Send Beautiful HTML emails from Bubble Through API connector
