Hello.
We know that beetween a name street that pops 2 options on the screen near you, and you don't know wich one to go, the post code search usually saves the trouble of going to the wrong direction, saving time and resources. So in that sense...

...The idea I'm sugesting consists on having a own WAZE database for post codes in Portugal run/managed with the Waze community and, that should be, the primary option when searching for post codes.
The CTT (primary mailing company in Portugal) as an APP for phone where you can determine a certain post code matches a given address. This can be used to cross-reference and update with accuracy on the Waze livemap.

Also on the livemap editing there should be a post-code for us editors to fill.
And when searching for a post code, on Waze, ideally it should pop a area with the streets that have that same post-code, so the user can easily identify the area for the post code and search visually for the street name is looking for.

Thanks for yout attention, waiting for your feedback.