The delivery optimizer feature will resend unopened invitations 3 days after the initial sending to ensure that you have the highest possible open rates and your important cards will not be overlooked. Having the delivery optimizer turned on should increase open rate 4-5%.
How to Turn on/off the Delivery Optimizer
Step 1: Click the “Details” step.
Step 2: Select the "Information" section.
Step 3: Click the "Advanced Options" dropdown.
Step 4: Click the "Resend Cards with Delivery Optimizer" toggle.