Have a nice day in mail

Here is a sample email with a "Have a nice day" closing:

Subject: Thank you for your business!

Dear [Recipient's Name],

I wanted to take a moment to express my gratitude for your recent [purchase/order/inquiry]. It was a pleasure serving you, and I hope you're enjoying your [product/service].

If you have any questions or need any further assistance, please don't hesitate to reach out. I'm always here to help.

Thank you again for your business, and have a nice day!

Best regards, [Your Name]

This closing is a friendly and professional way to end an email, and it leaves a positive impression on the recipient.