We recommend you to use a service like Dropbox or Soundcloud to safely share your music. The first one allows to share links, the second one has a private option. 2/3 audio tracks are great, or a single private video clip.
Since we're super selfish, we won't share anything you will send us.
Please be advised we often need 4 months from the day we have all the material, to the release day to correctly promote your music and work the best way possible.
Rushing things is an error, your career almost never depends on your album being release next month.
If you already have a fully prepared email, send it to email@example.com.