Hi [name],
I hope you’re well and doing great. I’m writing to let you know that I’ve been promoted to a new position at our company. The new role will be reporting directly to me and I’ll be handling all of the IT-related work for the company as well as helping with some of the administrative tasks.
The timing of this change is perfect, since it will allow me to focus more on my job and help you out with whatever you need.
I look forward to working with you on this transition!
Please let me know if there’s anything else we can do for each other.