If you are a web designer encouraging your clients to send email newsletters, it helps to have more than a technical understanding of email marketing. The web is full of fantastic resources to help you learn about the best way to use email newsletters to grow your business, and your client's businesses.

The more advice you can offer your clients, the more valuable you will be to them (and the more you can charge!). We've collected a few of our favourite blogs and sites here for you to check out.

• BeRelevant — Tamara Gielen's excellent blog on email best practices
• Email Marketing Voodoo — constantly posts great advice and links to research
• Email marketing reports — Mark Brownlow provides great articles, reviews and links
• Marketing Sherpa — A fantastic collection of articles & research in their email category

Dig into these resources and you will soon be able to help your clients get better results out of their email newsletters. If you have another favourite, let us know by leaving a comment.