Does Mails.ai use OpenAI?
Yes
We hold strong evidence for this.
- The company names it in its own subprocessor list, a statement that this vendor handles its customers' data.
- The company's privacy policy names it as a processor, controller or partner.
How we know
About Mails.ai
mails.ai provides an API that gives AI agents their own email inbox to send, receive, and reply to messages. It serves developers building AI agents and coding tools.
Summarized from its homepage on 12 Nov 2026.
What else Mails.ai uses
Mails.ai has evidence for 19 vendors. The strongest:
Cloudflare
Google Workspace
Better Stack
Gleap
Hetzner
PostHog
Sentry
Stripe
Vercel
Other companies using OpenAI
Check any company's vendors in seconds
See Mails.ai's full stack with a source for every vendor, and ask the same question about any company from the API, Claude or your browser.
- Every company and vendor, with its public source
- 100 API calls a month, plus MCP and the Chrome extension
- Work email only. No card, no sales call