MailKite vs Sendmux

“Delivery logs and metrics”

“Quotas at four levels: per-second, minute, hour, and day.”

“Inbox-scoped API keys Issue keys that can read and send for one mailbox, and nothing else.”

“Need dedicated infrastructure, SLAs, or volume pricing? Talk to us about enterprise”

“Create agent inboxes, send through your providers, and route with quotas, weighted delivery, and failover from one API.”

“Email API for AI Agents”

“Pay for what you use. Nothing else. No per-seat fees. No per-mailbox fees. No minimum commitments. Pay only when billable usage begins.”

Not in our latest capture. We captured this page again on Sep 17, 2026 and this quote was not there. How we re-check citations

“$0.15/1k recipients | No subscriptions | Free to start”

Not in our latest capture. We captured this page again on Sep 17, 2026 and this quote was not there. How we re-check citations

“Free to start · No credit card required”

Not in our latest capture. We captured this page again on Sep 17, 2026 and this quote was not there. How we re-check citations

“HTTP API and SMTP on port 587. Drop-in compatible with any agent framework you’re already using.”

“Connect Gmail, SendGrid, Mailgun, Resend, or any SMTP-compatible provider.”

“Teams 12 active · region: au”

“Email MCP, SDK, and CLI are live”

“your agent now has Mailbox, Sending + Management tools”

“Multi-tenant from the first request.”

“HTTP API and SMTP on port 587.”

“npx skills add Sendmux/skills”

“10M+ emails/day | Sub-second latency”

“Platform builders Scale from one agent to thousands. Built for companies running email for their customers' agents.”