# What is the external Do Not Call scrub on a blast?

It is an optional paid check against external Do Not Call and litigator lists, run before your SMS goes out. Turn it on in the composer with "Scrub phones against DNC / litigator lists before SMS". It stays off unless you switch it on.

You get a quote first. The quote counts your eligible unique phones, multiplies by the per-phone credit price, and shows the maximum credits it could cost. You consent to that quote before anything runs, and the quote expires, so a stale one is refreshed and rechecked before SMS is released. The final charge can land lower after suppression.

With the scrub off, your CRM do-not-disturb and stored suppression still apply. An audience is capped at 5,000 recipients.

Read online: https://docs.closemagnet.com/articles/questions/what-is-the-external-dnc-scrub