APIddress - email validation API

What are the six verdict types APIddress returns, and how do they differ?

APIddress returns deliverable (legitimate inbox), risky (valid but suspicious), disposable (temporary email service), role-based (info@, support@, etc.), malformed (syntax errors), and no_mx (invalid domain). Each verdict comes with individual signal checks so you can decide whether to accept, flag, or reject an address based on your own rules rather than a simple pass/fail.

Can I validate emails in real-time during signup, or only in batch?

APIddress works for both. It has a single endpoint for real-time form validation during user onboarding and a batch processing pipeline capable of handling 22 million rows per hour for cleaning existing contact lists. You can use whichever mode fits your workflow.

How much does APIddress cost after the free tier runs out?

APIddress offers 2,000 free validations per month. The pricing beyond that is not published on the known details. Check their site for paid plan rates and whether founding-member pricing applies to your account.

Does APIddress check if a mailbox actually exists, or just verify the domain?

APIddress does both. It performs syntax validation, checks MX records on the domain, and includes mailbox existence verification to confirm the inbox is real and accepting mail. It also detects disposable domains and suggests typos and domain corrections for addresses that are close to valid ones.