Resend old yahoo group emails, or another way to organize/search yahoo groups emails?

I’m a member of a massive yahoo groups email list. For the past year I’ve been having all of the messages forwarded to my gmail account. The result? Beautifully organized message put into conversations and incredibly incredibly easy to search and review.

But now I need to delve deeper into the email list’s messages. Yahoo has a search function to read the old (10’s of thousands) of messages, but it is terrible and it’s insanely difficult to find something.

Does anyone know of a way to resend all of the old messages to my gmail account so they get organized into conversations and I can use gmail’s search functions?

Alternatively, is there some other way to interface with yahoo groups to make it easy to search/organize old messages?

Thanks all!