Activate Greylisting for all Accounts and Alias'

Hi everyone
I would like to activate Greylisting for all Accounts / Alias'. Is there somewhere a bulk activation process?
As I've seen so far, I can only activate Greylisting on Account/Alias level.
As I already have quite a few accounts and alias' active, it would be quite cumbersome to manually activate greylisting for all accounts.

Any ideas on how I could automate the activation?

Thanks a lot for your help.

Regards
Chris

 

https://www.howtoforge.com/greylisting_postfix_postgrey

 

Thanks sjau
But how can I do it with ispconfig 3.1?
Greylisting is already installed and working fine for all the accounts where I manually activated Geylisting.
(And I would like to still be able to deactive Greylisting for certain account with the ISPConfig GUI)

Regards
Chris

 

server-wide greylisting can't be done in ISPC Webinterface I think.... I've used server-wide greylisting for years but moved away from it meanwhile.