Dear [Co-worker's Name],

Today is my last day at DTCC, and I want to take a moment to thank you for the camaraderie and collaboration we’ve shared. Working alongside you has been a wonderful experience, and I truly value the support and teamwork we’ve built over our time together.

Your professionalism and dedication have been inspiring, and I’ve learned a great deal from working with you.

Let’s stay in touch! You can reach me at [your personal email] or connect with me on [LinkedIn].

Wishing you all the best for the future. Thank you again for everything!

Warm regards,[Your Name]