What is Inbox Placement Testing?

Inbox placement testing sends messages to seed accounts across multiple MBPs, then checks whether they arrived in inbox or spam. This reveals where your email lands before sending to real recipients.

Testing process: send to seed panel (accounts at **Gmail**, **Microsoft**, **Yahoo**, etc.), wait for delivery, check placement programmatically, and report results. Tests can evaluate subject lines, content variations, and sending patterns.

Limitations: seed accounts lack individual engagement history with your domain, results represent testing moment rather than ongoing delivery, and panel composition may not match your audience. Use placement testing as one input among several, not as definitive truth.