12 things that destroy an Email's effectiveness:
1. Overly lengthy paragraphs
2. Overloading the "To" field
3. No context attachments
4. Unclear time sensitivity
5. Absence of a summary
6. Irrelevant subject lines
7. Missing a call to action
8. Not enough context
9. Lack of structure
10. Over-formatting
11. Unclear intent
12. Useless CCs
Avoid at all costs.
Anything you'd add to this?
P.S: I just received an email that meets 7/12 criteria above :)