You can copy the personalized link/URL of a recipients card from the Send page and send to your guest outside of the Greenvelope software.
How to Copy a Recipient's Card Link
Step 1: Click the “Send” step.
Step 2: Click the dropdown link on the far right of any contact row.
Step 3: Click the "Copy Link / Send Plain Text" link.
Step 4: Copy the URL in the resulting pop-up.