I just finished and printed my tax return from TurboTax. I'm going to mail it in. On the TurboTax mailing instructions, they have a section on "What you need to mail." It says, "Attach the first copy or Copy B of Forms W-2 to the front of your Form 1040." Do I really need to send all my W-2? Don't employers submit a W-2 automatically to the IRS? Only one of my jobs gave me the 4 copies of my W-2. Can I just photocopy them for the IRS?

Yes, you MUST attach a copy of the W-2.

You can mail a photocopy of the W-2 if you do not have enough copies.