A DPN is a high-stakes trap. The 21-day clock starts on the issue date, not...

https://dlf-ne.org/how-do-i-spot-a-lockdown-dpn-before-the-client-wastes-money-on-the-wrong-step/

A DPN is a high-stakes trap. The 21-day clock starts on the issue date, not when your client opens the letter. Distinguishing between lockdown and non-lockdown penalties is vital for your strategy