I want to check my outside email and not be bored to death all the time.
I'm not familiar with DeepNine, however reading up on it, it sounds likes its an effective tool to get people off non-work (task) related items. If this is something at work, and your trying to bypass, there may be consequences to bypassing the filter.
If your trying to do this from work, what I suggest is setting up an encrypted vnc connection to your home computer. That way, traffic can't be snooped, and your using your home machine to do any browsing you want. RealVNC is a good.
Do you have a mobile phone with data connection? Get one. Or start using an Android phone with Gmail. And then setup Gmail to receive all of your yahoo mail.