==== Required information ====
- iRedMail version: 0.1.8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): SQL
- Linux/BSD distribution name and version: Centos6
- Related log if you're reporting an issue:
====

I have a iredmail server with 2 virtual domains.Whether its possible to block all the attachments between the domains?

For example i have 2 domains like abc.com and xyz.com. abc.com users should able to send the mails with attachments to other abc.com users and not to the xyz.com users.Sameway xyz.com users should able to send the mails with attachments to other xyz.com users and not to the abc.com users.But both the domain users should able to send the mails each other.Whether its possible to do this?