Developers have made no secret of the fact that if they had to choose, they’d prefer being recruited over email. However, that doesn’t mean that any old recruitment email will make them excited about continuing the conversation. Your initial outreach to a developer is one of best chances you’ll have at making a good first impression, so understanding what they look for when they read recruitment emails will help you stand out from the competition.
More information: http://business.stackoverflow.com/blog/3-things-developers-wish-appeared-more-often-in-recruitment-emails