Inspect syntax, mail-server records, SMTP observations and catch-all, role-address and disposable indicators.
Responses distinguish valid, invalid, catch-all and unknown. SMTP availability and server behavior affect what can be confirmed.
Use the documented validation endpoint. Confirm current billing behavior before production integration; API credit packs do not cover positioning engagements.
Send the fields, market and intended workflow to hello@yute.io. Source access and coverage must be confirmed for your use case.