Kolab 3 and Amavis

[Siegfried Van Eygen]

I can't receive mails from an online agenda, sent whenever someone makes 
an appointment.

When I disable amavis, everything works fine. However, there should be a 
possibility to let them through without completely disabling amavis.

I searched the net for solutions, but everything I found concerns Kolab 
2.x.
Can someone tell me how to do this in Kolab 3?

Kind Regards

Siegfried Van Eygen