Get started in a few clicks
- Install the add-on from the Google Workspace Marketplace (where available).
- Open your Google Sheet and go to Extensions → [Add-on name].
- Follow the sidebar instructions to choose your data column (emails or URLs).
- Click Run / Verify and watch new status columns fill in.
Common issues & quick fixes
- Script timeout or “internal error” – try smaller batches (100–200 rows). Google Apps Script has built-in time limits.
- Authorization loop – remove the add-on, then install again and accept all requested permissions.
- Nothing happens after clicking run – make sure the correct sheet is active, the column is selected, and the file is not read-only.
- Slow checks – speed depends on external mail and web servers. Very slow domains can delay results.