MailVeri is an email verification API that cleans lists, catches invalid addresses, and cuts bounce rates before you send. Verify single emails or bulk lists, detect disposable and catch-all domains, and protect your sender reputation. Free to start at https://mailveri.com
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Cleaning lists before sending is the step most teams skip, so a verification API fits well into the sending flow. Do you flag catch-all domains separately, since those are the hardest to call valid or invalid?