I wish to let you all know that today is my last day at (company name) and I will be joining as (new position) at (the new company name).
I have enjoyed my time here and appreciate the support and help you have provided to me during my tenure. I want you all to know that even though I am excited about the new career, I am sad to leave you all, who have supported me all the time when I needed your help. I had a wonderful experience working with this company and have learnt many new things which I am sure will help me in my next position. I wish that my new job also provides me with great friends and colleagues like you. The time that I have spent with this company is one of the best times of my life which I am sure I will cherish throughout my life.
I will be missing you all and is looking forward to join a new team at the new company.
Do keep in touch and you may reach me at the email address at (email address).
Best wishes to all of you.
Thanks for everything,