I am missing a feature for a long time now:
What's called "mailgroup" in other mailservers.
I only use/need to make "group-mailaddress" which forwards the mail to other account's in the same domain (or external adrresses).
Sort of mailinglist, but much simpler.
I now use an user-account with limited rights and use the forward abilities. But it's not perfect.
Hope something like this would be in future release, or am I missing (over see) an option for years?