Directory · not scored
Email infrastructure for AI agents 10
Inboxes created and controlled through an API so an AI agent can send and receive email. Check each provider's terms before using it for cold outreach: several of them restrict unsolicited email.
Not a ranking yet: these tools do a different job from inbox providers, so our scoring would compare them unfairly. We list what we found on their sites (checked on Oct 5, 2026) and will publish a separate method for this category. Alphabetical order.
| Tool | Private SMTP/IMAP inboxes | Public API | Official MCP server | Domain purchase inside the product | Automatic SPF, DKIM and DMARC setup | Free plan, free trial or money-back guarantee | Prices published on the site | Entry price |
|---|---|---|---|---|---|---|---|---|
 AgentMailagentmail.to | $20/mo | |||||||
 Dead Simple Emaildeadsimple.email | $5/mo | |||||||
 Inkboxinkbox.ai | $30/mo | |||||||
 Lumboxlumbox.co | $9/mo | |||||||
 Mailjinnmailjinn.com | $19/mo | |||||||
 Mails.aimails.ai | $20/mo | |||||||
 Nylas Agent Accountsnylas.com | $15/mo | |||||||
 OpenMailopenmail.sh | $10/mo | |||||||
 Robotomailrobotomail.com | $19/mo | |||||||
 Shipmailshipmail.to | $4/mo |
stated on the tool's site · the site says it is not offered · not found.
Other directories: Warm-up tools · Deliverability testing · AI SDR