We are working on implementing Luminis 5.2.1 (on LifeRay 188.8.131.52 EE).
One of our former highly-paid consultants (how do I get a gig like that?) described to the higher-ups on our steering committee an out-of-the-box feature of Luminis that I have yet to locate.
He described a portlet that can instantly display announcements sent to it via email.
Right now, our institution heavily uses mailing lists (Listserv) for mass communication. The result is many users—especially students—ignore and mark a lot of that traffic as spam.