Microsoft Outlook is a web-based suite of webmail, contacts, tasks, and calendaring services.
Your maker gets the marked PDF and a clear fix list on the right task, with the reviewed version named.
Your reviewers find campaign drafts right on their review tasks. A comment shows which version came from email.
Your review cards show who made a proof decision and which file they saw. The reply time stays with the decision.
Your maker gets a clear fix list on the matching card, tied to the marked proof from the reviewer's email.