ISP-Specific Placement Behavior

Why does Outlook.com seem so hard? This section explores the "personalities" of the big providers. Gmail is driven by AI and engagement. Outlook/Microsoft is highly sensitive to complaints and "unknown user" rates. Yahoo/AOL rely heavily on FBL data.

13 questions in this topic

How does Gmail determine placement? How does Microsoft (Outlook, Hotmail) determine placement? How does Yahoo determine placement? What about Apple iCloud Mail? How do smaller regional ISPs behave differently? What unique signals do Gmail track (engagement, recency, machine learning)? What are Microsoft’s SmartScreen filters? How do ISPs weigh authentication and reputation differently? What’s unique about corporate domains vs consumer ISPs? How do ISPs differ in spam folder vs block behavior? What is “smart foldering” at Outlook? How often do ISP filtering rules change? What is the ISP learning curve for new senders?

Questions about ISP-Specific Placement Behavior