Deadly Sins (when using email)

I have just read this post. I subscribe to this opinion. And on the top of his 7 sins:
1. Hanging Questions
2. Buried Requests
3. Wrong Medium
4. Trying to Be Clever
5. Sending Urgent Requests Through E-Mail
6. Bulky Paragraph
7. Playing E-Mail Tag

I would surely put “Attach Huge Emails”. Seriously, this is very annoying. My mailbox is no 5GB+.