The sentence 'Thank you for letting me know' is correct and can be used in written English. You can use it to formally express your gratitude to someone for informing you of something. For example: "Thank you for letting me know that the deadline for the project is tomorrow. I appreciate it.".
Thank you for letting me know that someday, some employer may accept my unique contributions to the workplace, or even value them".
Thank you for letting me know that while I may think that I am dressing up for my Teacher Cadet lesson, I am in fact dressing to go to a night club or the whore house.
(He writes equations to help him remember: "String compliment = 'How nice of you to say so.'; String gratitude = 'Thank you for letting me know.' ") But even as a kid, Maxon never needed to decode his feelings for Sunny, and upon adolescence, once her kiss activated his binary love switch, "it never turned off again in his whole life.
"Thank you for letting me know about the car," he said.
You are now and forever an Olympian and I thank you for letting me comment on you and let the world know a little more about what you have been going through for the past 8 days.
"Thank you for letting me go legit".
"Thank you for letting me win today".
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union