将以下电子邮件列表按电子邮件域名分组。


1. example1@gmail.com
2. example2@yahoo.com
3. example3@hotmail.com
4. example4@gmail.com
5. example5@hotmail.com
6. example6@yahoo.com
- Gmail.com: example1@gmail.com, example4@gmail.com
- Yahoo.com: example2@yahoo.com, example6@yahoo.com
- Hotmail.com: example3@hotmail.com, example5@hotmail.com