How many types of email are there?

Related questions

1. How do I find my Google chat email address?
2. Do you know my email address?
3. Is Gmail more professional than Yahoo?
4. Are Gmail accounts safe?
5. Can I have 2 email addresses?
6. Why is it called email?
7. Can I have 2 Gmail email addresses?
8. How do you create a second Gmail email address?
9. Can I change my Gmail email address?
10. Are Gmail encrypted?

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16. #webmail
17. #types
18. #exchange