Mailbox Provider Breakdown

Not every inbox is the same. Gmail, Outlook, Yahoo, and Apple Mail each run their own filtering rules, reputation systems, and engagement thresholds — and a campaign that lands beautifully at Gmail can quietly stall at Outlook. OptiPub gives you a mailbox provider breakdown across the entire app, so you can see exactly how your email performs at every major mailbox provider and act on it.

See performance by mailbox provider, everywhere

Mailbox provider breakdown isn’t a single buried report — it’s woven throughout OptiPub. In message history, every send is broken down by provider so you can compare opens, clicks, bounces, and spam complaints at Gmail vs Outlook vs Yahoo vs Apple Mail side by side. In subscriber and segmentation views, you can see each subscriber’s mailbox provider and target by it. Wherever you’re looking at email performance, the provider-level view is right there.

Why mailbox-provider data matters for deliverability

Every mailbox provider judges senders differently. Gmail weighs subscriber engagement heavily, Outlook leans on its own reputation signals and SNDS data, and Yahoo and Apple Mail apply their own inbox-placement thresholds. Aggregate stats hide provider-specific problems: a rising Gmail spam rate or a sudden Outlook deliverability dip can stay invisible in your overall numbers until it becomes a full-blown inbox placement crisis. Provider-level visibility lets you catch and fix issues at the source — one mailbox provider at a time.

Segment and send by mailbox provider

Because mailbox provider data flows directly into segmentation, you can build segments by provider and put them to work: warm up a new IP against Gmail first, re-engage or throttle Outlook subscribers, tune send times by provider, or isolate a struggling provider for targeted list cleanup. It turns provider insight into provider strategy — and protects your sender reputation where it actually counts.

What you get

• Opens, clicks, bounces, and complaints broken down by mailbox provider on every send
• Coverage of Gmail, Outlook/Hotmail, Yahoo, Apple Mail/iCloud, AOL, and more
• Mailbox provider visible directly in subscriber and segmentation views
• The ability to segment, target, and send based on a subscriber’s provider
• Early warning on provider-specific deliverability and inbox-placement issues
• Provider-level data that complements Gmail Postmaster Tools and Outlook SNDS

Better together

Mailbox provider breakdown is part of OptiPub’s wider analytics suite. Pair it with Advanced Reporting for the full performance picture, Segmentation to act on provider data, and Deliverability + Compliance to monitor your reputation at each mailbox provider.