Why does the same email perform better on Gmail than Outlook?

Gmail responds primarily to recent individual engagement signals. Outlook evaluates your emails against a longer history of sending patterns, including volume consistency and cadence stability. A campaign with strong recent signals can perform well on Gmail while simultaneously triggering caution on Outlook if your sending behavior has shifted.

How can I tell if my deliverability issue is Outlook-specific?

Break your reporting down by inbox provider rather than reviewing aggregate campaign metrics. If Gmail engagement is stable while Outlook open and click rates have been declining over multiple sends, that is a provider-specific issue, not a content or list problem.

How long does it take to recover deliverability with Outlook?

Outlook recovery is gradual. Because it weights historical consistency, a single strong campaign won't reset placement. Sustained improvement across volume stability, list quality, and engagement over several sends is what moves the needle.

Does Outlook offer any tools or support for deliverability problems?

Yes. Unlike Gmail's more passive Postmaster tools, Outlook's postmaster team is actively responsive to sender outreach. If you're experiencing a significant placement issue, direct engagement with Outlook's postmaster is often the most productive path forward.