In her latest ClickZ column, Jeanniey Mullen says we have to be smarter about our segments and find ways to make e-mail work harder for us in this digital world.

These are the four new e-mail marketing segments that she says we need to know about:

The Social Influencer

These are people who signed up for your e-mails, but only respond to them occasionally. It's not that they don't love your brand -- they do. They're just too busy on Twitter, Facebook, LinkedIn, and 75 other networks to click on your e-mail.

Send them an e-mail that impresses them, though, and watch what happens. Nope, they still won't click through and buy, but they will post it to their groups and drive up to 412 percent more response to your campaign than you would have had with your entire list alone.

Why? These people are influencers. You know, the cool kids. Get these guys to love your message and your campaign will be bigger than you had ever dreamed.

The High-value Customer

Sometimes the people in this segment are mistaken as the most important on your list. In the new world of e-mail, these are called the short-term revenue drivers.

These people buy from you. But they love you so much, they want you to be their best kept secret. So there's very little exposure of your e-mail to their friends and family.

Think of these people as your revenue rock. They provide the base of money, while social influencers blow out your ROI.

The Wannabes

This is 80 percent of your list -- people who like your brand, but who need your help. They love the offers and the deals.

What are they looking for? For you to tell them how to best work with you. E-mail people in this segment with ways to leverage your Web site, access deals, and just plain be more engaged. They want to be high value or social -- they just need your help.

The "This is Spam" Clickers or Unsubscribers

These are people who felt your message wasn't relevant to them. Some were so uninspired they couldn't even find the time to look for the unsubscribe link -- they just clicked, "this is spam" to get you out of their inbox.

Beware! These people are really social influencers in disguise. One unsubscribe or "this is spam" click can equate to 10 people hearing about how bad your e-mail is.

In the new world of e-mail, these people should be targeted in different ways. Woo them back before they cause brand damage.

Read the full article here.