Trumailo - Realtime Email Verification

Does Trumailo actually connect to the mail server with an SMTP handshake, or does it just check MX records?

Trumailo performs a real SMTP handshake with the recipient's mail server as part of its verification. It combines this with synchronous checks like format validation and MX lookups, then handles SMTP verification asynchronously so the API response stays under 10ms and doesn't block your application.

What does the catch-all detection do, and why would I need it?

Catch-all detection identifies domains that accept mail to any address, which means an email address might be formatted correctly but unmonitored. This matters for list quality because catch-all addresses often bounce downstream or never reach a real person, so filtering them out improves your deliverability metrics before you send.

How often does Trumailo update its list of disposable email domains?

The disposable domain list, which covers 30,000+ addresses, updates daily. This keeps Trumailo current with new temporary email services that users might submit during signup or list imports.

What are the limits on the free tier?

Trumailo offers 5 free verifications per hour per IP during its beta period. The service is also available as open source, so you can run it yourself if you need higher volume without calling their API.