5/26/2023 0 Comments Email verifier tool![]() All major ESPs have their own custom grammar and syntax rules, affecting whether an email address is valid for that mailbox provider. ![]() Mailgun’s email address validator also factors in custom ESP grammar against Gmail, Hotmail, Yahoo Mail, Outlook, and more.We check emails against our sending cache of billions of emails to see if another Mailgun customer has attempted delivery to that address or not.Mailgun built its validator on both real-world data and RFC specifications to provide more accurate email validation. But in the real world, email service providers sometimes accept addresses that aren’t RFC-valid and reject addresses that are. ![]() RFC spells out the formal rules for email addresses.
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