A sorry letter is a formal letter written to apologize for a mistake or offense. It is important to sign off on a sorry letter in a way that is both sincere and professional. The most common way to sign off on a sorry letter is with a simple “Sincerely,” followed by your name. However, there are other options that may be more appropriate depending on the situation.
If you are writing a sorry letter to someone you know well, you may want to sign off with a more personal touch. For example, you could write “Best regards,” or “With love.” If you are writing a sorry letter to someone you do not know well, it is best to stick with a more formal sign-off.