Frequently letterbox systems are increasingly visually marred by a "proliferation" of stickers such as "No Advertising" or "No free newspapers".
At the latest when they become bleached and brittle due to weather conditions and you try to remove them.
Irremovable residues or even damage to the paintwork are then often the result.
Out of concern for problems with their landlord presumably many tenants refrain entirely from stickers and rather throw unwanted advertising and newspapers directly into the trash. – With the
known and actually unnecessary impacts on resources and the environment.
In addition, the area for long or more names is often too small.
Nametag holders for retrofitting, which on the one hand fit into the attachment sections of the common types of letterboxes, but which on the other hand offer a larger labeling area.
In these areas, there would be plenty of space for both the name(s) as well as the no-thank-you-message(s).
In order to find a matching plate holder which corresponds to the space and mounting options of your mailbox, these should be available in several variants.
Size suggestions (the dashed line indicates the mounting cutout)