Every time a new Google Sheets row is added, Integromat will automatically verify the address using Lob. If the address is undeliverable it will remove that row. This example uses (this sheet)[https://docs.google.com/spreadsheets/d/1I_0ORbuaKUyehO5qj7l3iWRNYELfAuG5lQzLfyuSw9A/edit#gid=0].
This is a predefined template that will make the creation of your scenario much easier. Of course, you can always expand and customize the scenario to meet your own individual needs.