linkifyjs
Find URLs, email addresses, #hashtags and @mentions in plain-text strings, then convert them into HTML <a> links.
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.
mailchecker
Cross-language temporary (disposable/throwaway) email detection library. Covers hundreds fake email providers.