This workflow allows you to validate emails stored in a table using the Mailcheck node.
Airtable node: This node will list all the records from a table. Based on your use case, you might want to replace this node.
Mailcheck node: This node will check the emails that got returned by the previous node.
Set node: We will use the Set node to ensure that only the data that we set in this node gets passed on to the next nodes in the workflow.
Airtable1 node: This node will update the Valid field in the table. Based on your use case, you might want to replace this node.