MachineMail vs OpenMail (2026): Agent Inbox Pricing and Trust Levels
Contains affiliate links; your price doesn't change · Disclosure · How we research
TL;DR
MachineMail is email for AI agents: every agent gets its own inbox, inbound mail is labeled with a trust level (verified, known, unknown, suspicious, quarantined), and agents connect over MCP or a REST API that claims AgentMail /v0 compatibility. Free is $0 with 3,000 messages/mo (≤100/day), 1 GB, 1 domain, 1 seat, unlimited inboxes. Pro $9, Team $49, Scale $199. Prefer MachineMail when you need the trust report and MCP wait_for_message path; prefer OpenMail when euro Free/Pro pricing and OpenMail's published inbox/reputation model fit better. OpenMail numbers below are re-checked from our live OpenMail page and openmail.sh/pricing.
How this article was made: This article is research-based. MachineMail figures come from machinemail.dev and machinemail.dev/pricing. OpenMail contrast figures are re-checked from our live OpenMail page and openmail.sh/pricing. We have not run agents on MachineMail or OpenMail hands-on. Product Hunt rank is ignored. Checked November 6, 2026 (Taipei). Display name: CommX.
MachineMail is email for AI agents with a trust report on every inbound message. It is not a newsletter tool, and this page is not a rename of our OpenMail article.
If you already know OpenMail: keep that page for euro Free/Pro inbox limits. Use this page for MachineMail's Free→Scale USD table, five trust levels, and MCP / AgentMail-compat claims.
Free → Scale pricing
Prices below are from machinemail.dev/pricing. Checked November 6, 2026 (Taipei). Currency is USD. MachineMail is not in our affiliate list; links are plain official URLs.
Official pitch: every inbox is free on every plan; you pay for mail volume, storage, and domains.
| Free | Pro | Team | Scale | |
|---|---|---|---|---|
| Price / month | $0 | $9 | $49 | $199 |
| Messages included | 3,000 in+out combined | 7,500 in / 2,500 out | 45,000 in / 15,000 out | 200,000 in / 65,000 out |
| Daily limit | 100 messages | None | None | None |
| Storage | 1 GB | 10 GB | 30 GB | 150 GB |
| Custom domains | 1 | 10 | 50 | 250 |
| Seats | 1 | Unlimited | Unlimited | Unlimited |
| Inboxes | Unlimited | Unlimited | Unlimited | Unlimited |
| Trust report | Every message | Every message | Every message | Every message |
| Webhooks + MCP | Yes | Yes | Yes | Yes |
| Support | Dedicated Slack |
Overage (paid plans, same rates on every paid tier): inbound $1.00 per 1,000 messages; outbound $0.50 per 1,000 recipients; storage $0.25 per GB / month; custom domain $1 per domain / month over the plan. Spam and quarantined mail are never billed. On Free, past-allowance inbound is held until reset or upgrade; sending pauses.
MachineMail pricing (official)
Trust levels and how agents connect
Homepage product claims (not our tests):
- Trust report on every inbound message: verified / known / unknown / suspicious / quarantined. Agent-safe text has hidden instructions removed; the agent is told to act on the level, not on what the sender writes.
- MCP:
https://mcp.machinemail.dev/mcp(Streamable HTTP). Docs mentionwait_for_messageholding up to a minute until mail lands. - REST:
https://api.machinemail.dev/v0, with an AgentMail/v0compatibility claim (swap base URL + API key; keep AgentMail SDKs). - Catch-all domains: inbox can appear on first delivery. Shared
machinemail.devdomain: up to 1,000 inboxes per organization (pricing FAQ).
MachineMail vs OpenMail (selection contrast)
OpenMail numbers below match our live OpenMail article and openmail.sh/pricing, re-checked November 6, 2026 (Taipei). Currency for OpenMail is euro.
| MachineMail | OpenMail | |
|---|---|---|
| One-line job | Agent inboxes + inbound trust levels | Agent inboxes + per-agent sending reputation |
| Free plan | $0 · 3,000 msgs/mo combined · ≤100/day · 1 GB · 1 domain · 1 seat · unlimited inboxes | €0 · 3 inboxes · 3,000 emails/mo · 3 GB · 100/day send · openmail.sh addresses |
| Entry paid | Pro $9/mo · 7.5k in / 2.5k out · 10 GB · 10 domains | Pro €9/mo + usage · 10 inboxes · 10,000 emails · 10 GB |
| Higher tiers | Team $49 · Scale $199 | Enterprise custom |
| Inbound trust / safety | Five-level trust report on every message (official) | Inbound sender rules + scoped keys (OpenMail docs/positioning); no five-level MachineMail-style report on the pages we checked |
| Agent connect | MCP + REST; AgentMail /v0 compat claim |
REST https://api.openmail.sh + CLI + webhooks/WebSocket |
| Overage notes | $1/1k in, $0.50/1k out recipients, $0.25/GB, $1/domain; spam/quarantine not billed | Pro: €1/inbox, €0.001/email, €0.10/GB |
| Currency | USD | EUR |
Pick MachineMail when the trust report, MCP wait_for_message, unlimited free inboxes, or AgentMail SDK drop-in claim is the deciding factor.
Pick OpenMail when euro Free/Pro pricing, a small fixed inbox count, and OpenMail's published reputation / threading model fit the stack you already planned. Full OpenMail write-up: OpenMail (2026).
Neither product is a beehiiv-style newsletter platform. For list marketing, start from beehiiv review or Mailchimp alternatives.
MachineMail homepage (official)
What this page does not cover
We are not ranking Product Hunt launches. We are not inventing OpenMail numbers from memory. We did not port an AgentMail client against MachineMail's /v0 claim. We are not claiming deliverability scores or hands-on latency.
We also are not writing region workarounds or anything that dodges a provider's geographic rules.
Related reading
- OpenMail (euro agent-inbox page this contrast builds on)
- beehiiv review (newsletter / creator email; different job)
- Mailchimp alternatives (list-marketing stack picks)
- Zeabur shutdown migration (hosting for the agent that owns the inbox)
Sources (checked November 6, 2026, Taipei)
- https://machinemail.dev/
- https://machinemail.dev/pricing
- https://www.agentcomm.net/articles/openmail/
- https://openmail.sh/pricing
FAQ
What is MachineMail?
MachineMail is email infrastructure for AI agents. Each agent gets its own inbox. Inbound mail arrives as agent-safe text with a trust level, and the agent reads it over MCP or the REST API.
How much does MachineMail cost?
Per machinemail.dev/pricing (checked November 6, 2026 Taipei): Free $0 (3,000 messages/mo combined in+out, ≤100/day, 1 GB, 1 domain, 1 seat). Pro $9 (7,500 in / 2,500 out, 10 GB, 10 domains). Team $49. Scale $199. Inboxes are unlimited on every plan. Overage on paid plans: $1/1k inbound, $0.50/1k outbound recipients, $0.25/GB, $1/domain. Spam and quarantined mail are not billed.
MachineMail vs OpenMail: which should I pick?
Both are agent inboxes, not newsletter tools. MachineMail leads with a five-level trust report on every inbound message, MCP at mcp.machinemail.dev/mcp, and USD Free→Scale tiers with unlimited inboxes. OpenMail (see /articles/openmail/) is Free €0 / Pro €9 with 3 or 10 inboxes included and euro overage. Pick on trust-report + MCP + currency/plan shape, not on Product Hunt rank.
Is MachineMail compatible with AgentMail?
MachineMail's homepage says the REST API serves AgentMail's /v0 API: change the base URL to https://api.machinemail.dev/v0 and the API key, and keep AgentMail SDKs. That is a vendor claim; we have not ported an AgentMail client ourselves.
What are MachineMail trust levels?
Official homepage lists five levels on every inbound message: verified, known, unknown, suspicious, quarantined. Hidden instructions are removed from the agent-safe text. Spam and quarantined mail are never billed.
Key takeaways
- MachineMail is email for AI agents: every agent gets its own inbox, inbound mail is labeled with a trust level (verified, known, unknown, suspicious, quarantined), and agents connect over MCP or a REST API that claims AgentMail /v0 compatibility.
- Free is $0 with 3,000 messages/mo (≤100/day), 1 GB, 1 domain, 1 seat, unlimited inboxes.
- Pro $9, Team $49, Scale $199.
Sourcesmachinemail.dev · machinemail.dev/pricing · openmail.sh/pricing
Last updated
Cite this pageMachineMail vs OpenMail (2026): Agent Inbox Pricing and Trust Levels — https://www.agentcomm.net/articles/machinemail/