Several methods can be employed to verify a subscriber's intent:
Double Opt-In
The most common and effective method is the double opt-in process. After a user signs up for your email list, they receive a confirmation email with a link to verify their subscription. Only after they click this link are they added to your list. This ensures that the email address is valid and that the subscriber is genuinely interested.
Confirmation Checkbox
During the sign-up process, include a checkbox that users must tick to confirm their subscription. Ensure that this checkbox is not pre-ticked, as that could be seen as deceptive or non-compliant.
Welcome Email
Send a welcome email immediately after someone subscribes. This email can serve as a soft confirmation and also provide an opportunity for the subscriber to opt-out if they change their mind.
Re-Engagement Campaigns
For existing lists, you can run re-engagement campaigns asking subscribers to confirm their interest. This can help in cleaning up your list and removing inactive or unengaged subscribers.