✓ Sendmux
Email inbox and sending API built for AI agents, with routing, quotas, and clean JSON parsing.
Why we recommend them
Sendmux is an email API that gives AI agents their own inboxes, lets them send through your chosen providers, and routes messages using quotas, weighted delivery, and failover. It's built for developers building agent workflows who need structured email data instead of raw HTML/MIME, plus webhook and SSE-based event handling.
✓Usage-based pricing at $0.15 per 1,000 emails, no subscriptions
✓Free to start, with SDK, CLI, and MCP support available
✓Strips signatures/quotes by default and returns clean JSON to cut LLM token usage
What we actually verified
8.5/10 TrustScore—Money-back guarantee verified
✓Free trial available“…Get started View Docs $0.15/1k emails | No subscriptions | Free to start agent-setup - sendmux live Give your agent an inbox Read”
✓Reachable customer service“…=9pJrK3xQn8mZv4wL2tH6y...; b=Xa4B9cQ8hP2wN... Message-ID : <[email protected]> From : "Example Support" <supp”
✓No fine-print return conditions
✓No unrealistic claims detected
Vetted 2026-07-21 · How we vet →
Common questions about Sendmux
Is Sendmux legit and safe to buy from?
Yes — Sendmux passed the WhatiseBrokering.com vetting checklist (try before you buy, no fine-print returns, a real way to reach them, realistic claims only) before being listed. We remove companies that stop meeting the standard.
Can I try Sendmux before committing, or get my money back?
Every company in our directory must offer a free trial or, at minimum, a 7-day money-back guarantee from the day your product arrives — with no fine-print return conditions like "unopened" or "original packaging". Sendmux met this requirement at the time of vetting.
How do I reach Sendmux if something goes wrong?
Sendmux publishes a real customer-service contact (phone or email) — that's a listing requirement. If you can't get a response, tell us at [email protected] and we'll review their listing.
Why is Sendmux listed on WhatiseBrokering.com?
We discovered and vetted Sendmux ourselves. They don't pay us anything — they're listed purely because they meet the standard.
Had a bad experience with Sendmux?
This directory only works if every listing keeps earning its place. If Sendmux didn't live up to the standard — refused a return, unreachable support, misleading claims, anything — tell us. We'll re-review them against our vetting criteria, and if they're not abiding by our rules, we remove the listing. No exceptions, no pay-to-stay.