Once again, the PTB have decided that Gmail and Yahoo Mail are evil entities and must be blocked because the spam filters for both of those programs are not as good as the one housed internally. Of course, those are the only two email programs that are blocked, not the thousands of others that have no spam filters whatsoever. Sometimes I have serious doubts about the intelligence required to work in our IT department or to become CEO of the whole institution.
UPDATE: Oh, I forgot to mention. When employees with children complained that they needed a way to keep in touch with their kids, the IT response was "Buy a cellphone so you can text back and forth."