Spam trap
An address used to detect poor list acquisition or hygiene.
Spam traps are addresses monitored by anti-abuse organizations or mailbox providers. They may be pristine addresses that were never opted in, or recycled addresses that used to belong to real people. Hitting traps is a strong signal of purchased, scraped, or stale lists.
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 spam trap, 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.