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When mass mailing by email, what do you put in the subject line and the email body?

For the body, do you paste the cover letter into the body or do you more or less put the first paragraph of your cover letter in the body (and have the full letter as an attachment)?

I put "Summer Associate Application - [school] [year]" or whatever in the subject line. Email body is a few lines about who I am, my experience/qualifications and relevant info like a reason for my interest in the firm or dates I'm going to be close to their office. I attach my documents including a formal business cover letter because I think it looks more professional.

For more info, a forum search might help