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.
Google Sheets
Lob