---
title: What are blacklist numbers and blacklisted emails.
description: While creating a marketing campaign, a business can face a blacklisted number or a blacklisted email while reaching their audience.
---
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# What are blacklist numbers and blacklisted emails.
## While creating a marketing campaign, a business can face a blacklisted number or a blacklisted email while reaching their audience.
- The blacklisted numbers are customers who have texted back STOP, to a text message that was sent to them.
- In addition, it could be a landline or an invalid number.
- The blacklisted emails address might have unsubscribed.
It's important to note that once a user is blacklisted, they cannot opt-in again on their own. They must contact us directly so that we can remove them from the blacklist.
We require proof of their consent. This is necessary to prevent potential complaints or legal action against our organization.
The user must send us an email at [support@kangaroorewards.com](mailto:support@kangaroorewards.com) with the following subject line: "I'd like to be opted in again for communication with **\[insert the name of the organization\]**. They should also include their phone number in the email.
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