They send a complete e-mail. That says:
Dear Mr/Ms [Name].
We have received your verified AMCAS application and all related secondary application documents. Your completed application will be reviewed in the near future to determine your competitiveness for an interview.
Our interview season begins in August and goes through April. If you are eligible for an interview, you may be invited during any given week throughout the admission cycle. If selected for an interview, you will be contacted by email to confirm a date for your interview.