__________ (Recipient’s Details)
Date: __/__/____ (Date)
Dear Sir/ Madam,
I write this letter in reference to the project __________ (mention name of the project) that we have been working on for a very long time. I would like to inform you that with your sincere efforts, our project is completed successfully and is achieving good heights in the market.
Further, I would like to thank you all for dedication and doing all the hard work, without which achieving completion of the project within deadline would not have been possible.
________ (Contact Number)