In dealing with spambots we are trying to lock down our outbound smtp email transmissions to a given set of domains. E.g. if someone is using the smtp server to send emails, we want to check the 'from' line and verify that the address exists in zimbra or at least the domain is one of ours.
Is it possible to accomplish this in zimbra or the tools that comprise it?
version: Zimbra Community Server 6.0.4