Joke Collection Website - Public benefit messages - Does the written notice have no head and no signature have legal significance?

Does the written notice have no head and no signature have legal significance?

It is of legal significance that the written notice is not submitted and signed. E-mail, short messages, letters, notices and announcements are all written notices, and they all have legal effect. Notice refers to formally or seriously informing others of one or some important information, which does not need any form, and can be written or oral.