The global blacklist blocks messages to specific phone numbers across all clients on the platform. Any message sent to a number on this list is blocked, regardless of which client submitted it.
Go to Settings → Firewall → Black list.
In the input bar, enter the phone number you want to block and optionally add a comment. To add multiple numbers at once, use the Select file button to upload a file containing the numbers.

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ⓘ All phone numbers must be in international format (e.g. 4479111234567). |
Click Add.
The number appears in the list immediately, and all future messages to it are blocked at the platform level.
Remove Numbers from the Blacklist
Go to Settings → Firewall → Black list.
Use the Phone number filter and Select the period at the top to find the entry you want to remove. Then either:
Check the box next to individual numbers and click Delete selected to remove only those entries.
Click Delete ALL to clear the entire blacklist at once.
