Subject of mail

Here are some common subjects for a mail:

1. Invoice: A bill for goods or services provided.
2. Order Confirmation: A confirmation of an online order or purchase.
3. Shipping Update: An update on the status of a shipment or delivery.
4. Payment Receipt: A receipt for a payment made.
5. Account Statement: A summary of account activity and balance.
6. Notification: A notification about a change in service, policy, or procedure.
7. Survey: A survey to gather feedback or opinions.
8. Promotion: An offer or promotion for a product or service.
9. Event Invitation: An invitation to an event, conference, or meeting.
10. Customer Support: A response to a customer inquiry or issue.
11. New Product/Service: An introduction to a new product or service.
12. Update: An update on a product, service, or feature.
13. Reminder: A reminder about a deadline, appointment, or task.
14. Refund: A refund or credit for a return or cancellation.
15. Complaint: A response to a complaint or issue.
16. Feedback: A request for feedback or comments.
17. Subscription: A notification about a subscription or membership.
18. Donation: A receipt for a donation or charitable contribution.
19. Tax Document: A tax-related document, such as a 1099 or W-2.
20. Other: Any other type of mail that doesn't fit into the above categories.

These are just a few examples of common subjects for mail. The subject line should be clear, concise, and relevant to the content of the email to help the recipient quickly understand the purpose of the message.