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.
Deliver the current campaign proof for your review with a deadline.
Your reviewer gets the current proof and a clear decision deadline by email when a card is ready for review.
Record your proof approval against the version you reviewed.
Your proof tasks show who decided, which file version they reviewed, and who takes the next step.