reject sasl_authenticated

[Tom Kinghorn]

Good morning list.

Is it possible to reject sasl_authentication from certain users?
we have a situation where certain accounts have been compromised.

Unfortunately, the team which enables / disables accounts on the master 
DB is  a) if a different geographical location and b) take up to 24 
hours to do so (management is looking into the process)

Is it possible, in the interim, toREJECT the logins from these users 
until the clientservices department does so on the DB?


thanks
Tom