- No welcome message.
- Not using the data gained from the questions asked about the recipient's preferences.
- Treating everyone on your list the same.
- Letting everyone in your organization mail to the customer.
- Sending plain text transaction emails without any cross promotion or up-sells.
Here are some tips and best practices on some of the mistakes that Chris points out.
How To Maximizing Email Welcome Message
Six Tips For Your Welcome Message Email
Preference Prove Profitable for Email Marketers
What is a Transactional Message?
Key Guidelines for Integrating Promotional Content into Transactional Email