Microsoft Outlook is a web-based suite of webmail, contacts, tasks, and calendaring services.
Place PDF corrections on the task for the reviewed page proof.
Your maker gets the marked PDF and a clear fix list on the right task, with the reviewed version named.
Record page proof decisions beside the reviewed PDF.
Your review cards show who made a proof decision and which file they saw. The reply time stays with the decision.
Turn page proof corrections into a checklist on the matching card.
Your maker gets a clear fix list on the matching card, tied to the marked proof from the reviewer's email.