The 21-day DPN clock starts on the issue date, not when it hits your desk....

https://www.mediafire.com/file/3zto6en4yl6ksac/pdf-56189-80359.pdf/file

The 21-day DPN clock starts on the issue date, not when it hits your desk. Distinguishing between lockdown and non-lockdown notices is essential for effective client protection. This guide covers the basics, so you can triage fast and keep options open.