Email Provider Blocked

After office hours yesterday, I found out that the email providers - Yahoomail, Gmail, etc - were block by our network department. Too bad, I can no longer send emails using those email providers.

Our company uses Lotus Notes in all work related correspondence and all regular employees is given a personal email account. But I think that still doesn't justify the fact to block those providers because some employees - like me - have to send emails through Yahoomail and Gmail. I just hope they reverse this action and unblock those providers again.