How to disable outgoing email. (crowd)

Problem

Currently, there is no way to disable SMPT from the crowd front end:
/crowd/console/secure/admin/mailserver.action. there is no documentation available online stating that this is possible with steps to do this.

Suggested Solution

Add a "disable" button on page /crowd/console/secure/admin/mailserver.action

Why This Is Important

Currently, customers can't disable SMTP from the front end.

Workaround

The below query will set Crowd's SMTP server to itself (so it will stop delivering the emails)

UPDATE cwd_property 
SET property_value  = 'localhost'
WHERE property_name  = 'mailserver.host';