It's generally accepted that the average person receives 122 emails per day, with the recipient only ever sending 34 emails. Getting a response from the recipient of your outbound e-mails is evidently tough so you'll need to be a little strategic about your emails - from the subject line to your writing style.
Boomerang are experts in the field and have recently published a new study. The study is built upon Data from more than 40 million emails which shows that by writing at a primary-school level will score you 36% more responses.
Using the right amount of emotion is also rather important. Your e-mail shouldn't be too positive eg. overusing exclamation marks with happy connotations leads to an actual decline in response rates - potentially because we're all a little too cynical and when we see someone happy, we don't believe it.
In fact, moderately positive or negative emails were the most effective, getting around 10-15% more responses than natural ones. This means that the next time you are composing an e-mail, you should give it a pinch of warmth (or hostility) - but only a little bit.
To find out more, check out the condensed version in the infographic below.