It's the first thing anyone sees when they receive an email, but it's amazing how often it's forgotten. It can grab your recipient's attention and encourage them to read on, or it can be an instant red flag that gets your email sent straight to the spam folder. It's usually short and succinct but, surprisingly, the only limit on the number of characters is truncated by your email provider. It can be funny, serious, intriguing, inspiring, or just plain factual. We are of course, talking about the humble email subject line, and if you didn't get it already, it's an important component of any good email.