Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Hand analysts a clean CSV and a report of skipped source lines.
Your analysts get CSVs from new text exports in a shared folder. A companion report points to source lines that need fixing.
Place the dated extract and delivery note in the shared folder.
Get a dated CSV and row count in your shared folder every month, or an error note explaining why the export stopped.