[siong1987]

See, the form is used to submit your business plan. If your email is something along the following line like:

"Hi, I have an 'amazing' opportunity for you to invest 'early' in a new startup. I am willing to meet at time XXX or you can call me at XXX."

It is very likely that you will get ignored. In fact, I did send an email with a rough business plan about my previous startup to the above email before. And, someone from a16z replied me telling me that they were not interested in the market that I was in then.

Why don't you try to send an email with a real/concrete proposal about your startup/idea? It is more likely that you will get a reply from them in this way.