How well do you understand email marketing? Even if you think you're in the know, you might be believing outdated or unsubstantiated "facts."

Here's a look at common misconceptions regarding email, according to the following Email Monks infographic.

All email recipients who opted in are loyal readers. False. "Some of them opted-in through proxy forms for incentives to surpass premium content gateways," suggests Email Monks.

Moreover, the length of time on a list can increase the possibility of spam complaints. "At 31 months, 43% of a list were more likely to complain," states Email Monks.