Artisan Obscura offers $5 off any order for signing up for their loyalty program. Before I joined the team, their welcome email said, "Thanks for signing up!"
That was it.
Now we have a robust welcome series that introduces the brand, engages the online community, and offers discounts to audience members. (Ecommerce sites report average open rates of 15.5%.)
Finally, I create and send seasonal sales emails. Using plenty of GIFs, of course.