Why Delivered Emails Still Land in Spam and How to Test Inbox Placement
A password reset email can be accepted by an API and marked as delivered while the user still cannot find it, because delivery signals do not show which folder the message reached. Services like Amazon SES separate acceptance of a sending request from delivery to a recipient's mail server, and neither of those events confirms inbox placement. Diagnosing the gap requires evidence from the receiving mailbox, such as a saved copy of the received message. Inspecting authentication results in that copy can reveal issues like SPF and DKIM alignment, though these reports are not independent proof of placement. The guide recommends running controlled seed-mailbox tests while keeping small samples from being treated as definitive guarantees.
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