Why Gmail API Doesn't Work for AI Agents
The Gmail API is designed for human users accessing their own email through applications. It requires OAuth consent in a browser, Google's ToS restricts automated sending patterns, and there's no way to create mailboxes programmatically. For AI agents that need autonomous email access, a purpose-built solution is required.
Feature
Gmail API
Robotomail
Auth model
OAuth 2.0 requires a human to consent in a browser. Service accounts need domain-wide delegation.
API key auth. No browser, no OAuth flow, no human in the loop.
Terms of Service
Google Workspace ToS restricts automated sending patterns. Accounts risk suspension.
Built for AI agents. Automated usage is the intended use case.
Mailbox creation
Cannot create mailboxes via API. Requires Google Admin console or Workspace provisioning.
One POST request to create a mailbox. Platform address ready instantly.
Pricing
Google Workspace: ~$7/user/month minimum. Each agent needs a separate seat.
Free tier: 1 mailbox, 50 sends/day. Paid plan: $5/mailbox/month.
Rate limits
Designed for human sending patterns. Per-user quotas, batch limits, and exponential backoff.
Per-mailbox daily send limits designed for agent workloads (up to 1,000/day on paid plan).
Inbound handling
Polling via Gmail API or Pub/Sub push notifications. Complex setup with watch requests.
Webhook delivery for every inbound message. HMAC-signed, parsed JSON payload.
Custom domains
Requires Google Workspace with domain verification through Admin console.
Add a domain, configure DNS records, and start sending. API-driven verification.
Data residency
Data stored in Google's infrastructure. Subject to Google's data processing terms.
Messages stored in your Robotomail account. Attachments in isolated object storage.
Ready to give your agent a real mailbox?
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