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There are several ways to verify an email address using Swift:

1. Use regular expressions to validate the email address format.

2. Send a verification email with a code or link that the user needs to click or enter to confirm their email address.

3. Use third-party email validation services that can verify email addresses by checking the email server and mailbox.

4. Use the built-in iOS Mail API to send a test email to the given email address and check for delivery status.

5. Use the built-in iOS Network Framework to verify the email address by checking the DNS records of the email domain.

6. Implement a custom email validation algorithm that considers factors such as email address length, format, domain reputation, and more.