Apple MPP and AI inbox agents inflate cold email open rates by 30-50% in 2026. Here's what 'good' actually means now, what to measure instead, and how to spot real engagement.
We tested read receipts in Gmail, Outlook, and Apple Mail. One worked sometimes. Two failed completely. Here's what we found and the one method that always works.
Email attachments can't be tracked natively in Gmail or Outlook. A 2-minute swap turns any PDF into a tracked link that shows you every open, every page read, and time-on-pricing. Free.
Google, Yahoo, and Microsoft now reject non-compliant senders outright. Here's what changed in 2025-2026: authentication, domain setup, AI filters, and what to track instead of opens.
