Which of these is a good practice to keep in mind when sending emails to your contacts?
(A) Run an A/B test on your subject line to determine which one works best
(B) Send the same generic and simple message to your entire contact database
(C) Include enough content in the email so there is no need for them to click away to read further elsewhere
(D) Only include a call-to-action on the landing page you’re linking to in the email