mailosaur
The Mailosaur Node library lets you integrate email and SMS testing into your continuous integration process.
cypress-mailosaur
Extends Cypress' cy commands that let you integrate email and SMS testing into your continuous integration process.
maildev
SMTP Server and Web Interface for reading and testing emails during development
preview-email
Automatically opens your browser and iOS Simulator to preview Node.js email messages sent with Nodemailer. Made for Forward Email and Lad. Cross-browser and cross-platform email testing.