Outlook / Hotmail Deliverability Test
Microsoft's Outlook and Hotmail inboxes are powered by the same filtering engine, which is known to apply some of the strictest spam rules of any major provider. Testing your email against Outlook-specific criteria before sending can prevent bulk blocks and improve your overall sender reputation with Microsoft.
Microsoft's SmartScreen filter places heavy weight on sender IP reputation through the Sender Score and Junk Mail Reporting Program (JMRP). For static analysis, our deliverability test examines the signals you can directly control: authentication records, content structure, and header completeness — all of which influence how Microsoft's filter processes your message.
ISP Deliverability produces a dedicated Outlook/Hotmail heuristic inbox score alongside your Gmail score, so you can see where your email stands with both major providers and prioritise fixes that improve both simultaneously.
Outlook-specific signals we analyse
- SPF and DKIM pass/fail with domain alignment checks
- Aggressive spam keyword detection in subject and body
- Script and active content detection
- From/Reply-To consistency
- Missing unsubscribe mechanisms