In this article Matt Blumberg suggests that email marketers should continually request feedback from their newsletter subscribers. Why? Because it's the best way to learn whether your newsletters are relevant to your audience and you can find out what works and what doesn't.
A couple of tips:
- Keep it short and simple: no more than 7 questions per survey. Do test varying lenghts of surveys to determine what works best for your audience.
- Focus on the needs and interests of your audience.
- Embedded forms in HTML emails yield the highest response. However, in certain email clients (eg. Hotmail) embedded forms don't work, so test carefully!