Number 1: 
Claire Mail
Email, calendar and reminders in one fast app for Mac and iPhone, with AI that triages your inbox and preps your meetings
- Email & notification APIs
- DR 14 +1 (up) since last check
Email & notification APIs
Sendmux
Email API that gives AI agents a real inbox with send, receive, and routing capabilities
- Community votes
- 0
- DR by Ahrefs
- 39 no change since last check
Ahrefs Domain Rating benchmarked 1 Nov 2026, rebuilt 1 Nov 2026.
Multi-provider email API for AI agents with inbound mailboxes, outbound routing, and webhooks. Send through your own providers with automatic failover.
What it is
Sendmux is an email API designed for AI agents and SaaS platforms. It provides a unified API surface for sending and receiving email, with support for multiple outbound providers including SMTP, Gmail, Microsoft 365, and Amazon SES. The platform includes dedicated inboxes on custom domains or shared @myagent.mx addresses, automatic provider failover and routing with weighted distribution, and message parsing that returns clean JSON with extracted text, reducing LLM token usage by up to 80%. Built for multi-tenant deployments, it offers team and mailbox-scoped API keys, signed webhooks, Server-Sent Events, and usage-based billing with no per-seat or per-mailbox fees.
What it is built with
- Multi-provider outbound routing with weighted distribution
- Dedicated inboxes with clean JSON parsing
- Mailbox-scoped API keys
- Signed webhooks and Server-Sent Events
- Per-provider quotas at multiple time windows
- Unified inbox view for all agent mailboxes
- Message parsing reducing LLM token usage by 80%
Pricing
Free: $0/team/month with 2 mailboxes, $1 usage credit, 50 recipients/day. Pro: $7/team/month + usage. Connected outbound: $0.50/1,000 accepted recipients. Managed sending: $0.75/1,000. Inbound: $0.50/1,000 mailbox deliveries. Storage: $0.02/GB/month.
Sendmux metrics
| Metric | Value |
|---|---|
| Domain Rating | 39 no change since last check |
| Trust Flow | 28 no change since last check |
| Citation Flow | 35 no change since last check |
| Referring domains | 241 no change since last check |
| External backlinks | 6,595 no change since last check |
Ahrefs Domain Rating benchmarked 1 Nov 2026, rebuilt 1 Nov 2026. Main build topic: Computers/Data Formats (27). Majestic benchmarked 1 Nov 2026, rebuilt 1 Nov 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
Sendmux domain build sheet
Open the build sheet
| Domain age | 8 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | Cloudflare, Inc |
| DNSSEC | Signed |
Sendmux after-launch build log
Since Sendmux launched on Maker Launches on 1 November 2026, these are the figures we have tracked.
- Domain Rating (Ahrefs)
- 39
- First measured 1 Nov 2026
- Referring domains (Majestic)
- 241
- First measured 1 Nov 2026
Day 0 since launch. Next receipt: day 30, 1 Dec 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Compare and explore
Questions from the bench
- What is Sendmux?
- Sendmux is the email API for AI agents and SaaS platforms combining multi-provider outbound sending, agent inboxes, dedicated inbound mailboxes, team-scoped controls, webhooks, Server-Sent Events, and usage-based billing. Teams can send through their own providers or managed sending, then read replies through the Mailbox API, IMAP, webhooks, or live events.
- Can I use my own SMTP or email provider?
- Yes. You can connect SMTP, Gmail, Microsoft 365, or Amazon SES sending accounts. Delivery groups let you set weights, quotas, and sender-domain routing. Sendmux skips unhealthy providers and keeps traffic inside the providers allowed by the API key or mailbox credential.
- Does Sendmux include inbound mailboxes?
- Yes. You can create mailboxes on myagent.mx or verified custom domains. Each mailbox can receive mail, send mail, hold messages, expose mailbox-scoped credentials, set sender rules, and stream events. Rejected inbound mail from mailbox rules is not billed as accepted inbound usage.
- What are Sendmux webhooks and Server-Sent Events for?
- Webhooks allow your backend to receive signed event POSTs even when an agent is offline. Server-Sent Events let an agent keep an HTTP connection open and react immediately as soon as a mailbox event arrives. Both are live product surfaces.
- What can an AI agent do with Sendmux?
- An agent can send, receive, reply, read threads, stream new mailbox events, download attachments, and use scoped credentials tied to one mailbox. The Mailbox API exposes messages, threads, folders, identities, usage, quotas, submissions, and clean message content, so agents don't need a human webmail session.
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