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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Bounce rate and sender reputation are what hurt teams most. For bulk verification, do results come back with a reason code per address (disposable, catch-all, syntax, no mailbox) that I could use to segment a list instead of a simple valid/invalid flag?