1. Relying on images
Most email systems now block images by default (» like this). If you overuse images, you may be forcing the user to click extra buttons before they see any of your message - that's if your email got delivered past the spam filter in the first place.

2. Breaking the Law!
Many marketers are still unaware that that they are required to include certain information on their email campaigns. You are legally obliged to include your registered company name, company address and company number.

3. Forgetting to test
Ever seen your email in Firefox & Hotmail? Forgetting to test your campaigns can result in your audience receiving an inferior version of your email (» like this). By testing your campaign before broadcast, you can avoid your email being mistaken for a Picasso.

4. Using a web designer
Many web design companies have email marketing divisions. What they don't realise is that coding for email is very restrictive. Many common web coding techniques are blocked by email systems and the integrity of the email is compromised.

5. Too Wide!
If your email is too wide you could be forcing your audience to scroll horizontally as well as vertically. Whilst this may sound fairly trivial, you would be surprised how many people just won't bother. We aim to keep our emails to a maximum width of 600 pixels, ensuring all of the audience see all of the email.