I think there are two possibilities (but had not confirmed it is actually enabled):
configure notification over this dynamic group. Unfortunately you will be receiving notification without list, and most probably for each device separately.
use scheduled reports. It should be possible to prepare report which shows devices in specific group (or maybe dynamic groups can be completely bypassed here). Once reports is prepared, it is possible to schedule it to be sent to email, and there should be possibility to not send empty data.