The process of validating the accuracy and legitimacy of email addresses in an email database. This involves checking if the email addresses are correctly formatted, active, and capable of receiving emails without bouncing. Email verification typically includes several steps: syntax verification to ensure proper email format, domain validation to confirm the domain exists and can receive emails, and mailbox verification to check if the specific email address is currently active and not a role-based or temporary address. This process helps improve deliverability rates, reduce bounce rates, and maintain a positive sender reputation by ensuring that emails are sent to valid and engaged recipients.