Cooper Email is an email API that gives each AI agent its own inbox. Free is $0 and includes 5 inboxes and 5,000 emails a month.
Comparisons
Pick the mail stack that matches the job.
Each page cites a public source and the date it was retrieved. Prices move. If a number here and the vendor page disagree, the vendor page is the one to trust.
- Cooper Email vs AgentMail (2026)Cooper Email vs AgentMail in 2026: published plans, limits, and agent features side by side, with sources and the date they were retrieved.
- Cooper Email vs ResendFactual comparison of Cooper Email, an agent inbox, and Resend, a transactional email API. Prices retrieved 2026-11-05. Resend figures were not recounted on 2026-11-05; they still match the 2026-10-10 record.
- Cooper Email vs Twilio SendGridFactual comparison of Cooper Email and Twilio SendGrid Email API pricing, retrieved 2026-09-27.
- Cooper Email vs the Gmail APIFactual comparison of Cooper Email and the Gmail API for agent mail, using Google’s quota page.
- Cooper Email vs MailgunFactual comparison of Cooper Email and Mailgun sending plans, retrieved 2026-09-27 from mailgun.com/pricing.