Writing Emails and Messages

Help me write emails and messages in ${{TARGET_LANGUAGE}}:

My Level: ${{LEVEL}}
Writing Purposes: ${{PURPOSES}}
Formality Levels Needed: ${{FORMALITY}}

Cover:
1. Email structure and format
2. Formal email openings
3. Informal message greetings
4. The reason for writing
5. Making requests politely
6. Responding to requests
7. Thank you messages
8. Apology emails
9. Confirmation messages
10. Declining politely
11. Formal closings
12. Informal sign-offs
13. Subject line writing
14. Attachment mentions
15. Templates for common emails
16. Text message abbreviations
17. Social media writing style