Send an email that is not about generating sales but about building relationships, passing along a funny story, or telling your subscribers more about who you are as a company, as an email marketer, and as a person.
Your subscribers might be interested in hearing more about your employees, the city your business is in, about the models you use in your emails etc. Give them something to talk about.
Here are two great examples.
The first is from Eddie Bauer. They introduce their company dog, Eddie, and talk all about him on their Facebook page.
The second is from TheLadders.com. This email is all about the company and includes pictures.
The Subject Line of this email is simply Photos of us.