Why can placement vary by user or region?
Placement variation occurs for several reasons:
User-level engagement models: Each recipient has a unique relationship history with senders. Personal engagement data shapes individual decisions.
Regional filtering differences: Some providers apply different policies for different regions or have varying spam levels to contend with.
IP reputation by geography: Sending infrastructure may have different reputation in different regions.
Localized spam patterns: Filters may be tuned to region-specific abuse patterns.
Two users in different countries checking the same message from the same sender can see different placement results.
The same ship receives different inspections at different ports.
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