Campaign Monitor is a great tool for delivering email newsletters, and it is geared towards designers. It is not only a great service for graphic designers to use to send their own emails, but also for them to use for their clients who want to design an email newsletter and need help selecting and setting up a service to deliver it.
A/B testing allows you to create two versions of an email newsletter that vary in some way, deliver each version to a select group, and then send the most successful version to the rest of your mailing list. The Campaign Monitor A/B testing has a user-friendly interface and powerful features.
Within Campaign Monitor, your two versions can have a different subject line or "from" name, or you can even provide completely different content and design. Once you have set up the two newsletters, you define the percentage of your subscribers that should receive the test, and decide what variable to base the "winner" on; open rate, unique clicks or clicks on a specific link. Once the test is complete (you can also choose how long to let it run), Campaign Monitor will automatically send the most successful version to the remaining percentage of your mailing list.
While creating different versions of a newsletter can take time, it is a great way to see what variables affect how well your newsletter reaches your audience. Even just varying the length of copy or image sizes can change how people read your newsletter, especially with inboxes filled with emails. It is likely worth that extra time, even if you just choose different subject lines, to get a few more clicks out of a mailing. You never know which click can lead to a new client or a lead for one of your customers.