Email APIs

Email services and validation

17 APIs in this category
17
APIs listed
8
need no API key (47%)
8
CORS enabled (47%)
17
HTTPS (100%)

This directory lists 17 email APIs. 5 of them require no API key and support CORS, so you can call them directly from browser JavaScript with no backend and no sign-up. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.

Showing 17 of 17 APIs

Abstract Email Validation

Validate email addresses for deliverability, syntax, and spam risk detection

Auth: apiKey HTTPS CORS: Yes

apilayer mailboxlayer

Real-time email address validation and verification service

Auth: apiKey HTTPS CORS: Unknown

Cloudmersive Validate

Validate email addresses, phone numbers, VAT numbers, and domain names

Auth: apiKey HTTPS CORS: Yes

Disify

Detect disposable, temporary, and invalid email addresses instantly

Auth: No HTTPS CORS: Yes

DropMail

GraphQL API for generating and managing temporary email inboxes

Auth: No HTTPS CORS: Unknown

EVA

Simple and fast email validation API

Auth: No HTTPS CORS: Yes

Guerrilla Mail

API for creating disposable and temporary email addresses

Auth: No HTTPS CORS: Unknown

ImprovMX

API for custom email forwarding and routing

Auth: apiKey HTTPS CORS: Unknown

Kickbox

Free and reliable email verification API for real-time validation

Auth: No HTTPS CORS: Yes

mail.gw

Temporary email API for creating disposable inboxes (10-minute mail)

Auth: No HTTPS CORS: Yes

mail.tm

API for generating temporary and anonymous email addresses

Auth: No HTTPS CORS: Yes

MailboxValidator

Validate and verify email addresses to improve deliverability

Auth: apiKey HTTPS CORS: Unknown

MailCheck.ai

Detect and block disposable or fake email addresses during signup

Auth: No HTTPS CORS: Unknown

Mailtrap

Safe email testing tool for development and staging environments

Auth: apiKey HTTPS CORS: Unknown

Sendgrid

Cloud-based SMTP and transactional email sending API

Auth: apiKey HTTPS CORS: Unknown

Sendinblue

Marketing and transactional email/SMS API with advanced analytics

Auth: apiKey HTTPS CORS: Unknown

Verifier

API for verifying whether an email address is active and valid

Auth: apiKey HTTPS CORS: Yes

Best Email APIs for Developers

An email API allows developers to send transactional emails, validate addresses, detect disposable domains, and manage delivery infrastructure without running their own mail servers. These APIs are critical for password resets, order confirmations, and notification systems.

CodeHelper's curated email API collection includes APIs covering transactional sending, bulk campaigns, address verification, and temporary email detection.

What to look for in an email API

  • Deliverability: Choose providers with strong sender reputation and built-in SPF/DKIM support for high inbox placement rates.
  • Webhook events: Delivery, open, and click webhooks let you track email engagement and handle bounces programmatically.
  • Template support: Dynamic templates with variable substitution simplify sending personalized emails at scale.

How to use this API directory

  1. Browse the curated list of APIs below.
  2. Click any API to visit its documentation.
  3. Check the Auth column to understand what credentials you need.

Whether you are building a notification system or an email validation service, this free curated API directory saves you hours of research.

Related

toolXML FormatterProfessional XML formatter with syntax highlighting, statistics, XML to JSON conversion, and XPath query tester.toolBase64 Encoder/DecoderEncode and decode Base64 strings, files, images with data URL support. Upload files or paste text for instant conversion.toolJWT Decoder & ValidatorDecode, validate, and inspect JSON Web Tokens (JWT). Parse header, payload, verify signatures with HMAC algorithms, and check token expiration: all client-side.