Can I prevent bad customer from using their services?

[ignasigarcia]

Hi there. We have a customer not paying for the services they requested. We have no choice but to temporarily block their services (web and email accounts). I've noticed I can deactivate their web service (and visitors will get a 503 error). However, for the email accounts (they have many), I've tried going to their email domain and deactivate, but only incoming messages to their accoounts are rejected, and they can still use smtp services to send messages. Is there a way I can completely block their email services without changing passwords or deleting accounts?

TIA,

Ignacio