Date: DD/MM/YY (Date on which letter is written)
Sender Name/Your name…
Sub: Sincere thanks for the promotion
I would like to extend my sincerest thanks to you for believing in me and considering me for the promotion. (Describe in your words). I am truly obliged and inspired by your decision. I assure you, I will give my best to come up to your expectations and you will not regret this decision of promoting me to the position of (Promoted position name). (Explain your confidence and dedication).
The fact that you have so much faith and confidence in my capabilities makes me want to work even harder. (Explain your feelings). I assure you that I will deliver my 100 percent for all duties assigned in a responsible manner and will not let you down. (Describe your greetings).
Thanking you once again for providing me this wonderful opportunity.
Contact info. and signature…
Another Format, [Email Format]
To: Receiver mail address, email@example.com
From: Sender mail address, firstname.lastname@example.org
Sub: Thanks for Considering Promotion
I would like to express my gratitude for providing me with this brilliant opportunity for showing my potential within a company. (Describe in your words). By promoting me to the position of marketing manager, you gave me a chance to realize the potential I have to the benefit of our firm. (Show your appreciation).
I want to thank you for trusting me and I will try to do my best in order not disappoint you. New duties of this position will be performed in a responsible way. (Describe your greetings).
I look forward to starting my work in a new position and I am confident that you will not regret your decision. (Explain your confidence and dedication).
Thank you again for the granted opportunity.