Okay, I need some help. I want to pull 10,000 Gmail messages from one Gmail account into another Gmail account. Any idea how I can do that without a lot of mess?

I don’t want to download all the messages via POP3 to a mail client and then forward or redirect every message to the new Gmail account. I can’t seem to find a “mass forward” in Gmail. Does that feature exist?

It looks like you have to open each of the 10,000 messages to find the forward feature. Is there a way to get my new Gmail account to tell my old Gmail account to “send me everything you have and I’ll keep it over here instead of over there?” Is there a separate program that will do this for me? Help!