Subscriber verification typically involves several steps:
Double Opt-In: After a user signs up, they receive a confirmation email with a link to verify their subscription. This ensures that the email address is valid and owned by the person who signed up. Email Validation Services: These services check the syntax, domain, and mailbox of the email address to confirm its validity. Reconfirmation Campaigns: Periodically sending reconfirmation emails to your list can help weed out inactive or invalid addresses.