Inbox placement
Whether delivered email lands in the inbox instead of spam.
Delivery only means the receiving server accepted the message. Inbox placement asks where the message landed after filtering. Seed-list tests and panel data can estimate placement, but no test perfectly represents every recipient inbox.
reading this as SaaS product teams
A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.
Applied to inbox placement, that means weighing multi-tenant support, event stream, the suppressions API, and operating track record ahead of the rest, against trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail.