Here's the URL just incase you don't know about it: http://www.yousendit.com/ Hopefully this isn't tooo urgent. good luck
I think www.yousendit.com , www.pando.com are the 2 clients which I know which will send your 10 MiB+ attachment
simply use a archiving tool such as winrar or winzip and split your file in to 10Mb parts and send as separate attachments..