My all masterfull corporate tester claims:
a) Cannot see a way to request an "email read" receipt AND an "email received" receipt. I kinda really know how does that work inside most mail clients (i developed it in phpgrupware). So.... i cannot seem to find that either so i thought id just holler your way.
b) Cannot see a way for a user to create her own distribution lists based on gal and/or (preferably both) personal contacts. This is usually a hack in most aplications. Its a hack in exchange, its a hack in phpgroupware... i propose a hack:
Lets make tags in addressbooks a 'special' kind of email address. tag:tagname@domain entered in the To: box should be expanded to the emails of the enclosed addressbook entries with a default (say, work email), configurable by preference.
So, lets be able to email a "tag"