To: [Insert name]
From: [Insert name]
Subject line: Internal Promotion Offer
Hi [Employee name],
We are excited to officially promote you to the role of [insert role] as of [insert date].
Attached you will find your updated contract covering your new employment terms together with your compensation package and benefits. Please sign and return it by [insert date].
We appreciate your diligence and commitment and look forward to seeing you achieve great things in your new role.
[Insert email signature]