OpenMail vs Sendmux
55 fields both were evaluated on, 27 of them different — including where one discloses something the other does not. Every value links to the document it came from. 28 further fields are disclosed by neither and are listed at the end rather than tabled.
Assurance
| Field | OpenMail | Sendmux |
|---|---|---|
| Audit trail· | no public information www.openmail.sh · checked Aug 6, 2026 | |
| Runtime governance· | Allowlists and blocklists by email or domain — scoped per account, pod, or inbox “Sender rules Allowlists and blocklists by email or domain — scoped per account, pod, or inbox.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | “Quotas at four levels: per-second, minute, hour, and day.”sendmux.ai · checked Aug 7, 2026 |
| Permission scopes· | scoped per account, pod, or inbox “Sender rules Allowlists and blocklists by email or domain — scoped per account, pod, or inbox.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | “Inbox-scoped API keys Issue keys that can read and send for one mailbox, and nothing else.”sendmux.ai · checked Aug 7, 2026 |
| Compliance certifications· | GDPR “every customer is covered by GDPR — not as a checkbox, but as a legal guarantee.”www.openmail.sh · checked Aug 6, 2026 | no public information sendmux.ai · checked Aug 7, 2026 |
| Regulatory alignment· | GDPR “every customer is covered by GDPR — not as a checkbox, but as a legal guarantee.”www.openmail.sh · checked Aug 6, 2026 | no public information sendmux.ai · checked Aug 7, 2026 |
| SLA terms· | no public information www.openmail.sh · checked Aug 6, 2026 | “Need dedicated infrastructure, SLAs, or volume pricing? Talk to us about enterprise”sendmux.ai · checked Aug 7, 2026 |
Agency
| Field | OpenMail | Sendmux |
|---|---|---|
| Autonomy level· | 5 “Channel Fully autonomous Incoming email triggers an autonomous reply. No human in the loop.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | no public information sendmux.ai · checked Aug 7, 2026 |
| Human oversight· | No human in the loop “Channel Fully autonomous Incoming email triggers an autonomous reply. No human in the loop.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | no public information sendmux.ai · checked Aug 7, 2026 |
| Goal complexity· | multi-step “Signup automation Browser agents that can actually sign up. OTP codes, verification emails, 2FA - your agent handles the full signup flow without a human in the loop.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | no public information sendmux.ai · checked Aug 7, 2026 |
| Action space· | read, write “OpenMail is a real email API for AI agents. Give each agent its own inbox, send and receive email, and get replies instantly.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | “Create agent inboxes, send through your providers, and route with quotas, weighted delivery, and failover from one API.”sendmux.ai · checked Aug 7, 2026 |
| Operating environment· | email “OpenMail is a real email API for AI agents.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | |
| Initiative· | can self-initiate “Channel Fully autonomous Incoming email triggers an autonomous reply. No human in the loop.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | no public information sendmux.ai · checked Aug 7, 2026 |
Safety
| Field | OpenMail | Sendmux |
|---|---|---|
| Data handling· | GDPR-compliant data handling “every customer is covered by GDPR — not as a checkbox, but as a legal guarantee.”www.openmail.sh · checked Aug 6, 2026 | no public information sendmux.ai · checked Aug 7, 2026 |
Practicality
| Field | OpenMail | Sendmux |
|---|---|---|
| Pricing model· | “Pay for what you use. Nothing else. No per-seat fees. No per-mailbox fees. No minimum commitments. Pay only when billable usage begins.”sendmux.ai · checked Aug 7, 2026 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 | |
| Price point· | Start For Free “Start For Free → No credit card required · Cancel anytime”www.openmail.sh · checked Aug 6, 2026 | “$0.15/1k recipients | No subscriptions | Free to start”sendmux.ai · checked Aug 7, 2026 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 |
| Availability· | no public information www.openmail.sh · checked Aug 6, 2026 | “Free to start · No credit card required”sendmux.ai · checked Aug 7, 2026 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 |
| Deployment options· | SaaS “One command to give OpenClaw or Claude Code a real inbox. Or talk directly to the REST API — WebSocket for instant replies, no polling.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 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.”sendmux.ai · checked Aug 7, 2026 |
| Integrations· | Claude Code, LangChain, Vercel AI SDK, OpenClaw, Hermes, NanoClaw “Integrates with Works where you work. Claude Code LangChain Vercel AI SDK OpenClaw Hermes NanoClaw”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | “Connect Gmail, SendGrid, Mailgun, Resend, or any SMTP-compatible provider.”sendmux.ai · checked Aug 7, 2026 |
| Supported regions· | EU “We're EU-Based. That's Not a Footnote — It's the Point. OpenMail is built in the EU, runs in the EU, and every customer is covered by GDPR — not as a checkbox, but as a legal guarantee.”www.openmail.sh · checked Aug 6, 2026 |
Ecosystem
| Field | OpenMail | Sendmux |
|---|---|---|
| Protocols supported· | Webhooks, WebSocket “Webhooks or WebSocket — pick what fits your stack.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | |
| Tool use· | Tool On demand “Tool On demand The agent sends and reads email when you ask.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | “your agent now has Mailbox, Sending + Management tools”sendmux.ai · checked Aug 7, 2026 |
| Multi-agent· | no public information www.openmail.sh · checked Aug 6, 2026 | |
| API access· | yes “Or talk directly to the REST API — WebSocket for instant replies, no polling.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | |
| Marketplace presence· | ClawHub “Install the OpenMail skill from ClawHub”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations |
Impact
| Field | OpenMail | Sendmux |
|---|---|---|
| Deployment scale· | no public information www.openmail.sh · checked Aug 6, 2026 | |
| Target sectors· | support “AI support inbox Support that replies itself. Your agent receives, triages, and threads support emails.”www.openmail.sh · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 10, 2026 and this quote was not there. How we re-check citations | “Platform builders Scale from one agent to thousands. Built for companies running email for their customers' agents.”sendmux.ai · checked Aug 7, 2026 |
| Documented incidents· | SUSPENDED gmail “SUSPENDED gmail Analysis 12 min read The Gmail suspension wasn't the problem. The architecture was.”www.openmail.sh · checked Aug 6, 2026 | no public information sendmux.ai · checked Aug 7, 2026 |
Disclosed by neither
Both OpenMail and Sendmux publish nothing on these 28 fields. That is a finding about the category rather than a difference between them, so it is recorded here instead of as 28 identical table rows. Each is shown with its source check on the individual profiles.
- User base
- High-risk domains
- Support model
- Base models
- Model provider
- Model swappable
- Open weights
- Fine-tuning
- Context window
- Open source
- Safety evaluations
- Red teaming
- Safety policy
- Usage restrictions
- Model or system card
- Incident reporting
- Third-party evaluations
- Insurance available
- Insurance carriers
- Coverage limits
- Indemnification
- Liability cap
- Tamper-evident log
- Explainability
- Outcome-based pricing
- Settlement mechanism
- Dispute process
- Evaluation coverage
Questions
- How do OpenMail and Sendmux compare on autonomy level?
- OpenMail: 5. Sendmux: no public information disclosed.
- How do OpenMail and Sendmux compare on human oversight?
- OpenMail: No human in the loop. Sendmux: no public information disclosed.
- How do OpenMail and Sendmux compare on goal complexity?
- OpenMail: multi-step. Sendmux: no public information disclosed.
- How do OpenMail and Sendmux compare on initiative?
- OpenMail: can self-initiate. Sendmux: no public information disclosed.
- How do OpenMail and Sendmux compare on documented incidents?
- OpenMail: SUSPENDED gmail. Sendmux: no public information disclosed.
- How do OpenMail and Sendmux compare on data handling?
- OpenMail: GDPR-compliant data handling. Sendmux: no public information disclosed.