When writing a letter or an email, the question is: is it acceptable to use “Much Appreciated” as a closing for it? Is there a certain protocol for how to close these pieces, or does it just depend on personal preference?
“Much appreciated” is a way of thanking someone for some service they have done. As it is a very abbreviated way of saying “What you’ve done for me is very much appreciated by me”, many believe “much appreciated” is really a very informal and casual kind of sign-off. In this case, it would likely not be appropriate to use “much appreciated” in every situation. For letters and emails that are professional, for example a work email, some kind of exchange for a job interview, or other formal correspondence, it would not be recommended to include such a brief sign-off. A full sentence, such as “I appreciate all you’ve done” would likely be more appropriate.
On the flip-side, “much appreciated” can be a slightly more formal way of addressing people in an otherwise informal dialogue. It can be a quick reply to a friend for taking care of something for you or for providing you with needed information. It can also be a way to acknowledge very casually the work someone has been doing. Although it is grammatically acceptable as a closing phrase, it is simply not commonly used for anything but the more casual conversations. The best advice would just be to us this closing at your best discretion.