How does a company send notices to employees in a very formal way?

if the company is relatively large, the main departments will be notified by a special person first, and then the competent departments will print out the written documents in the official document format of the company, and the written documents will be delivered to the employees themselves for signature by a special person.

Of course, you can also use email and Q group form, but there are loopholes in this way. Some people will not read Q and email for some reason, and it will not be delivered until now, so these two types can be used for unimportant notices and activities. Written form is mainly an important activity and thing, so it is not easy to make mistakes to ensure that everyone delivers it.