Litmus explicitly forbids any of our users from using Litmus Personalize for subscribers who have not opted-in. Our Terms of Use (which all users must agree to) state:

Under no circumstances may you use our tools in connection with the sending of Unsolicited Commercial Messages (spam). This includes our Email Analytics tools. You warrant that all your subscribers are opt-in and that every message you send has an appropriate mechanism for unsubscribing from your mailing list.

Our full terms of use

What to do if you've received spam

If you've received an email containing that you believe is unsolicited, please let us know immediately by forwarding the email to Our support team will investigate within 24 hours. If we discover the sender of the email is abusing the domain, we'll disable that user's account and blacklist them from using our products and services in future.

Questions and concerns

If you have any other questions or concerns, we'd love to hear from you! You can reach us at or by calling us on +1 (866) 787-7030. Our support team typically answer emails within 24 hours.


We’re here to help. Reach out to our customer support team at any time.