Andrew Findlay wrote:
'mail' is not listed as an allowed attribute. If you want to add that attribute then you also need to include a suitable auxiliary object class that permits it. I don't think there is such a class in the standard set, so you will have to create one of your own.
That's the use-case for
http://tools.ietf.org/html/draft-stroeder-mailboxrelatedobject-02
Ciao, Michael.