What is split-testing inbox placement by segment?
Split-testing by segment isolates placement differences across audience groups:
Send to engaged subscribers separately from dormant ones. Compare placement results. Often reveals that disengaged segments experience worse placement.
Test different acquisition sources. List A from double opt-in versus List B from single opt-in may show different placement patterns.
Segment testing reveals which portions of your list help or hurt overall deliverability.
Send different portions of your fleet to different routes and compare reception at each destination.
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