Do you need a red-headed document for the notification letter?

Red-headed documents represent a kind of formality and respect. If the letter sent by the subordinate company to the superior company is an important document, the red notification letter indicates that the subordinate company attaches importance to this issue, which is of course different from the general contact letter.

Another is to send a red-headed circular letter to the superior company, which also shows that the subordinate company can only submit it to the superior company for approval after formal discussion and full argumentation because it has authority, which is completely different from the general discussion.

Therefore, if it is an important issue, it is normal and formal for the subordinate company to report to the superior company with a red-headed circular letter. Generally speaking, subordinates don't need to report to the superior company with a red-headed notice letter.

In addition, it doesn't really matter whether the red-headed documents are red-headed documents or not. The key is to stamp the official seal of the company to represent the exchanges between companies. What you need is to show the company's behavior, not the file format.