The One Thing You Should Never, Ever Do

http://www.whatcounts.com/2013/10/one-thing-never-ever-do/
There are some things in life that you should avoid doing at all costs: Driving in the oncoming traffic lane, jumping out of a plane without a parachute, keeping up with the Kardashians, and so forth. The same holds true in email marketing, as there is one thing that you should never, ever do: