Link: Cp 517

For example, let's consider a postal code like M4B 1B5. In this case, the "CP" designation might be used to indicate a specific sorting facility or region.

Suppose you're sending a package from Toronto to Vancouver. If the postal code is incorrect (e.g., V5Z 1C5 instead of V5Z 1C3), the package may be delayed or misdirected. cp 517 link

A "CP" designation, in this context, might relate to a specific sorting or classification process. However, without more context, it's difficult to provide a precise explanation. For example, let's consider a postal code like M4B 1B5

That being said, here's a gripping column on the topic: V5Z 1C5 instead of V5Z 1C3)