Within 100 milliseconds of viewing someone's face, your brain forms assumptions on an individual's attractiveness, likability, trustworthiness, competence, and aggressiveness. So, what happens in a lean communication channel like email, where you only have 100 to 300 words to connect with a stranger?

Fractl and BuzzStream surveyed more than 1,200 men and women between the ages of 18 and 64 to find out how email best practices differ by gender, age, and education. Here's what they found.

1. More than 78 percent of respondents said email etiquette had an impact on their decision to engage with a stranger.

Email Best Practices

2. More than 88 percent of people have rewritten emails to sound more intelligent.

3. Older demographics want to be perceived as more authentic, while younger demographics want to sound more educated.

4. 60 percent of people agree that brevity is most acceptable, whereas 48 percent think wordiness is mostly unacceptable.

5. More than 60 percent of people believe humor in email is acceptable.

6. 70 percent of people find excessive punctuation in an email is unacceptable.

7. More than 30 percent of people think it's of little importance to link to social networks in an email signature.

Learn more about the email best practices that could improve your close rates!