The subject line.
Arguably the most important component of the email, the subject line is the deciding factor in whether your message is read or deleted.
The start of the email sets the tone for the main body. In the opening words the reader is making a judgement about you and what you want, and whether they will continue to read.
The bit in the middle.
Long, waffling emails are a massive turn off to anyone — especially to journalists who receive dozens or even hundreds of unsolicited emails a day. Even if the recipient opens your email, a page-long essay will probably inspire him or her to close out of it.
Assuming the recipient sticks with your email to the end, the way you sign off is as important as the way you start. End your email by making clear what you would like the reader to do, but don’t do it in a commanding way.
Read More: http://www.entrepreneur.com/blog/225719