Dedicated IP
A sending IP reserved for one customer.
A dedicated IP isolates a senders reputation from the shared pool. Useful at high volume (1M+/mo) or for regulated industries that need predictable reputation. Below that volume, a dedicated IP can hurt deliverability because mailbox providers cannot build a reputation profile.
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 dedicated ip, 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.