I have a problem which I hope SmarterTools can come out with a solution to fix it.

This is more of a human issues rather than software issue.

My customer’s IT admin issued their end-user a secure password, but the end-user decided to change it to an insecure one, which has already been found in 4,034,619 breaches according to https://haveibeenpwned.com/Passwords

Here is my settings and I am sure that the end-user has creative ways for this

That bring me to an idea whether SmarterMail download the entire list of the hashed password (

https://github.com/HaveIBeenPwned/PwnedPasswordsDownloader) 

and give additional options

[ ] Check and warn end-users for breached password

[ ] Prevent password change if found in breached database