I have an mp3 file that I made for a college project and saved that I am trying to email to my professor. It is 10mb in size and it doesn't seem to be able to be emailed. Any suggestions?

Compress it some more to lower the file size.

I forget exactly where the settings are, but I believe it's something like Edit-> Preferences, then look for Encoding or MP3 settings. Lower the bitrate and see if that helps compress the file some more.

10MB is usually the limit for most e-mail attachments.