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This is done by the mail provider themselves, its very rare to transfer files with more than 10mb of attachment... Check whether Yahoo have a service where you pay to transfer large files as e-mail attachment
You can't its a limit imposed by the mail server. Since Yahoo's limits are higher than 3MB, the limitation may be on the recipient's side. Try YouSendIt.com.
P.S. I moved this to E-mail forum where it belongs.