Disable ALL users LOGIN only?

Disable ALL users LOGIN only?

Hi, i have a question….
Is it possible some how disable ALL user logins?
What do i mean?
If i disable A user… domain and emails from this user dosent work… OK
NOW i want to disable ALL users login….
I mean so that no user (except admin) can login to DA
WHY?
Coupple of days my server was compromised, becouse some how a pasword for a user was "guessed" and then somehove they tryed to send 50.000+ emails via this user….
So… becouse none of my users actualy need (or do they?) login i want to disable this…
Is it possible??? if yes, how?
Of no, why not?:confused:
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