You can choose from hundreds of templates. You can use them as they are or customize them to suit your needs.
Every time a new Google Sheets row is added, Integromat will automatically send a postcard to the person in the sheet using Lob and update the row in the sheet.
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].