Howto disable SMTP service for specific mailbox

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Linux/BSD distribution name and version: CentOS 6
- Related log if you're reporting an issue:
====

Hello.

Is there a way how to disable SMTP service for specific user/mailbox using VMAIL database?

I allready tried to change mailbox.enablesmtp and mailbox.enablesmtpsecured to 0, but it doesn't help.
I belive disabling mailbox using mailbox.active=0 will do the job, but it will disable mailbox completely which is not the way i want to go...

Thanks in advance.

Best Regards,
Stanislav