Send email without SSL (a particular machine)

==== Required information ====
- iRedMail version: 0.8.5
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: CentOS 6.4
- Related log if you're reporting an issue:
====

Hello!

I have several printers in which I can't setup ScanToEmail funcionality during to the lack of SSL support. Is it possible to define a group of machines that could perform SMTP delivery without SSL authentication (maybe anonymous)?

Thanks.