Set how many inboxes your agents need and how much mail they send each month.
List prices as of October 2026, monthly, before tax. Google Workspace uses the $7 Business Starter annual price per seat; each agent address is a seat and each seat can send about 2,000 emails a day. AgentMail adds $2 per extra inbox and $2 per extra 1,000 emails on Developer. Resend adds $1 per inbox beyond 3 and $0.90 per extra 1,000 emails on paid plans, and inbox mail counts against the sending quota. Check each vendor before you buy.