AGPC Domain Check
Check a domain's SPF, DKIM, DMARC and MX with a graded shareable report
No keyCORSHTTPS
Free Email APIs
Free public APIs for email, each one verified and kept up to date.
36 listed · 11 need no key · 11 work in the browser
Email Validator by LifeStep
Validate email syntax and MX, detect disposable/role addresses, suggest typo fixes
No keyCORSHTTPS
EVA
API for email verification.
No keyCORSHTTPS
Kickbox
Email verification API
No keyCORSHTTPS
mail.gw
10 Minute Mail
No keyCORSHTTPS
Best Temp Mail
Disposable inboxes for automated email testing, with OTP extraction
No keyHTTPS
Disify
Validate and detect disposable and temporary email addresses
No keyHTTPS
DropMail
GraphQL API for creating and managing ephemeral e-mail inboxes
No keyHTTPS
Guerrilla Mail
Disposable temporary Email addresses
No keyHTTPS
mail.tm
Temporary Email Service
No keyHTTPS
MailCheck.ai
Prevent users to sign up with temporary email addresses
No keyHTTPS
Atomic Mail
Email for AI agents: programmatic inbox creation and send/receive over JMAP
API keyCORSHTTPS
EmailJS
Send emails directly from client-side JavaScript without a backend server
API keyCORSHTTPS
ImprovMX
API for free email forwarding service
API keyCORSHTTPS
Kiprio Email Validate
Free email validation: MX check, disposable detection, syntax
API keyCORSHTTPS
Tempmail API
The Tempmail API provides users with disposable email addresses that can be used for temporary registrations or verifications. It allows users to manage their temporary inboxes, retrieve emails, and perform various email-related operations securely and anonymously.
AuthCORSHTTPS
WHOIS Domain Monitoring
This API provides automatic WHOIS monitoring for domains, alerting users via email when critical changes occur, such as expiry dates, registrar alterations, or nameserver modifications. Users can track up to two domains for free with no sign-up required, ensuring they never lose control of their domains.
AuthCORSHTTPS
Cloudmersive Validate
Validate email addresses, phone numbers, VAT numbers and domain names
API keyHTTPS
Custom Temp Mail
The FreeCustom.Email API allows users to instantly generate disposable email addresses without registration or ads. This service enables users to create inboxes for receiving emails, extracting OTPs, and managing messages efficiently.
AuthHTTPS
DNS Lookup API
This API allows users to query various DNS record types, including A, MX, TXT, and more, returning clean JSON responses. It simplifies domain monitoring, email deliverability checks, and SPF/DMARC validations through easy integration with Python and Node.js.
AuthHTTPS
Email Validation
Validate email addresses for deliverability and spam
API keyHTTPS
Fried Apps API
The Fried Apps API allows users to generate temporary email addresses with just one click. It enables users to receive emails directly in their browser toolbar without the need for sign-up.
AuthHTTPS
inboxsink
Disposable inboxes for end-to-end tests that wait for the email and extract OTP codes
API keyHTTPS
Kiprio API Suite
Kiprio provides a collection of 27 focused HTTP APIs designed for developers, covering various functionalities such as NLP, DNS lookups, email validation, and more. Each API comes with a free tier, allows easy access via a single key, and is designed for quick implementation and integration.
AuthHTTPS
All 36 Email APIs
- AGPC Domain Check
- Email Validator by LifeStep
- EVA
- Kickbox
- mail.gw
- Best Temp Mail
- Disify
- DropMail
- Guerrilla Mail
- mail.tm
- MailCheck.ai
- Atomic Mail
- EmailJS
- ImprovMX
- Kiprio Email Validate
- Tempmail API
- WHOIS Domain Monitoring
- Cloudmersive Validate
- Custom Temp Mail
- DNS Lookup API
- Email Validation
- Fried Apps API
- inboxsink
- Kiprio API Suite
- MailboxValidator
- Mailtrap
- PostStack
- RankFabrik Verify
- Sendgrid
- Sendinblue
- SMTPfast
- Temp Mail API
- Temporary Email API
- Temporary Email Service
- uchecker
- Verifier
Free Email APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free email APIs are there?
We track 36 in this category, of which 28 responded at our last check. 11 of them need no API key.
Which email APIs work without an API key?
11 of the 36 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these email APIs in a browser app?
5 entries in this category need no key and return CORS headers, which is the combination that lets you call them straight from client-side JavaScript. The rest need a server or a proxy in between.
Which is the fastest free email API?
Of the keyless options that responded at our last check, mail.gw was quickest at a median 521 ms. Speed is only one factor — coverage and licensing usually matter more — but it is measured here rather than claimed.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 487 of 2,712 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.