Invalid email address examples

Here are some examples of invalid email addresses:

1. example - missing the @ symbol
2. example@ - missing the domain name
3. example.com - missing the @ symbol
4. [email protected] - extra dot before the domain name
5. [email protected] - numbers only before the @ symbol
6. [email protected] - hyphen at the beginning of the local part
7. [email protected] - extra dot at the beginning of the domain name
8. example@example - same domain name as the local part
9. [email protected] - extra dot at the beginning of the domain name
10. [email protected] - IP address instead of a domain name
11. [email protected] - hyphen in the middle of the local part
12. [email protected] - extra dot at the beginning of the domain name
13. [email protected] - extra dot in the middle of the domain name
14. [email protected]. - extra dot at the end of the domain name
15. [email protected]. - extra dots in the middle and at the end of the domain name
16. [email protected]. - hyphen at the beginning of the domain name
17. [email protected]. - extra dot at the beginning of the domain name
18. [email protected]. - hyphen in the middle of the domain name
19. [email protected]. - extra dot at the beginning of the domain name
20. [email protected].. - extra dots in the middle and at the end of the domain name

Note that these are just a few examples of invalid email addresses, and there may be other ways to create an invalid email address.