Write to shvabra123@proton.me. Please include the link to the page and, for a wrong address, the place on the map.
A wrong or missing address
Street addresses on Zipdress come from OpenStreetMap. Use OpenStreetMap's Report a problem page to tell its mappers about a wrong or missing address, or fix it yourself with a free OpenStreetMap account. Each address panel on the map has an “Open in OpenStreetMap” link to that exact spot.
A wrong postal code in a city list
City pages list postal codes from GeoNames and OpenStreetMap. A code that is wrong in OpenStreetMap can be fixed there in the same way; the lists are rebuilt from the data regularly.