IP warming
Gradually ramping volume on a new IP to build reputation.
Mailbox providers (Gmail, Outlook, Yahoo) treat brand-new IPs with suspicion. Warming means sending small volumes for the first weeks, ramping up gradually, and prioritizing engaged recipients. Required for dedicated IPs and self-hosted setups.
reading this as teams building autonomous agents
An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.
Applied to ip warming, that means weighing inbound parsing, idempotency keys, webhook coverage, and operating track record ahead of the rest, against inbound parsing into tool calls and model-generated sends that must not duplicate.