EmailJS

Send emails directly from client-side JavaScript without a backend server

Official docs outline

Extra Credit builds an outline of EmailJS's docs the first time your work uses it. Until then, start at the official documentation.

Disban Classify email domains as disposable, free, alias, testing or parked to block fake signups
Disify Validate and detect disposable and temporary email addresses
DropMail GraphQL API for creating and managing ephemeral e-mail inboxes
Email Spam Tester Send a test message and get a spam score, 41 checks with RFC citations and a fix plan
Email Validation Validate email addresses for deliverability and spam
Email Validator by LifeStep Validate email syntax and MX, detect disposable/role addresses, suggest typo fixes
EVA Validate email addresses
Guerrilla Mail Disposable temporary Email addresses
ImprovMX API for free email forwarding service
inboxsink Disposable inboxes for end-to-end tests that wait for the email and extract OTP codes
Kickbox Email verification API
Kiprio Email Validate Free email validation: MX check, disposable detection, syntax