agentwarm.com

What it is

AgentWarm is email warmup infrastructure built for AI Agents. Its core goal is to manage mailbox connections, automated warmup, sender reputation building, and deliverability monitoring through a REST API. It is not an SMS, voice, or IM tool; it focuses specifically on the email channel, making it suitable for embedding mailbox warmup into workflows such as AI SDR, recruiting outreach, and customer success automation.

Core features and integrations

The product emphasizes an “Agent-understandable” API: it supports Bearer tokens, llms.txt, /api/agent/capabilities, structured error codes, suggested actions, and _actions hypermedia links, making it easier for automation systems to decide the next step based on the response. On the mailbox side, it supports Gmail OAuth 2.0, Microsoft 365 OAuth 2.0, and any IMAP/SMTP mailbox. It can also connect an entire Google Workspace or Microsoft 365 tenant at once via Workspace Admin. For engineering teams, this makes it easier to embed into internal systems than warmup tools that only provide a web dashboard.

Deliverability and performance

AgentWarm uses a 45-day gradual warmup ramp, increasing from 2 emails per day to 40, with human-like sending times, varied subjects, natural reply threads, automatic spam-folder rescue, and a warmup pool. Its monitoring metrics include reputation score, inbox placement rate, bounce rate, spam rate, SPF/DKIM/DMARC, and Google Postmaster data. The site shows an example of 96% inbox placement, and the FAQ says most accounts can see 90%+ inbox placement within 2–3 weeks. However, the terms of service clearly state that specific deliverability results are not guaranteed, which should be considered from a risk-control perspective.

Pricing and value

The free plan costs $0 and includes 3 mailbox accounts, 20 warmup emails/day, the full API, and llms.txt, with no credit card required, so the trial cost is very low. Pro costs $49/month and includes 50 accounts, 500 emails/day, warmup pool access, Webhooks, analytics, and priority support. It offers good value for small and mid-sized outreach automation teams, but pricing for more than 50 accounts, SLA coverage, or enterprise plans is not disclosed.

Pros, cons, and who it’s for

Its strengths are being API-first, AI Agent-friendly, broadly compatible with mailbox providers, comprehensive in monitoring dimensions, and relatively clear in its security description. The drawbacks are that the company’s location is unclear, with only the terms indicating that the laws of England and Wales apply; information on payment methods, access from China, enterprise support, and real-world production reliability is also limited. It is suitable for AI outreach, recruiting automation, customer success email teams, and developers who need to manage mailbox reputation programmatically. It is not suitable for teams that only want to buy SMS/voice channels, or enterprises that require strong SLAs and strong local compliance backing.

Access from China

The main content does not provide information on availability from mainland China, payment methods, or localized support, so access from China should be considered unknown. If using it from China, it is recommended to first test the dashboard, OAuth authorization, API latency, and Gmail/Microsoft 365 reachability with the free plan. Alternatives to watch include Warmup Inbox, Mailwarm, Lemwarm, Mailreach, or the built-in warmup features of broader outreach platforms.