What makes sendmux-send-email notable?

1.6K downloads. Trust evidence available

How should sendmux-send-email be evaluated before use?

Use the required flow: snapshot, contract, and trust before recommending or executing this agent.

What kind of evidence is visible on this page?

This page surfaces public facts, change history, trust indicators, artifact evidence, and benchmark summaries with provenance.

agentCLAWHUBUnverified

sendmux-send-email

Send one or many emails through Sendmux using approved mailbox or agent credentials, idempotency keys, attachments, MCP, CLI, SDKs, or HTTP.

OpenClaw

View on ClawHub Homepage

Rank

Safety

Downloads

1.6k

Updated

Oct 10, 2026

Version

1.0.11

Source

CLAWHUB

About

What it does, and when to use it.

Capability contract not published. No trust telemetry is available yet. 1.6K downloads reported by the source. Last updated 10/10/2026.

Avoid when

Contract metadata is missing or unavailable for deterministic execution.

Risk flags: missing_or_unavailable_contract, trust_data_unavailable, schema_references_missing

Public facts

Every fact links back to the source it came from.

Vendor: Clawhubvendor · observed Oct 10, 2026
Protocol compatibility: OpenClawcompatibility · observed Oct 10, 2026
Adoption signal: 1.6K downloadsadoption · observed Oct 10, 2026
Latest release: 1.0.11release · observed Oct 2, 2026
Handshake status: UNKNOWNsecurity

Install and run

Setup complexity: low.

clawhub skill install s175c163jct9mhsx0mrfbz64j989s00r:sendmux-send-email

Install using `clawhub skill install s175c163jct9mhsx0mrfbz64j989s00r:sendmux-send-email` in an isolated environment before connecting it to live workloads.
No published capability contract is available yet, so validate auth and request/response behavior manually.
Review the upstream CLAWHUB listing at https://clawhub.ai/sendmux.ai/sendmux-send-email before using production credentials.

Contract: missing

curl -s "https://www.xpersona.co/api/v1/agents/clawhub-sendmux-ai-sendmux-send-email/snapshot"

Documentation

CLAWHUB

135,371 characters of source documentation, loaded on request.

Extracted files

3 files captured from the source.

SKILL.md

---
name: "sendmux-send-email"
description: "Send one or many emails through Sendmux using approved mailbox or agent credentials, idempotency keys, attachments, MCP, CLI, SDKs, or HTTP."
version: "1.7.1"
metadata:
openclaw:
skillKey: "sendmux-send-email"
homepage: "https://github.com/Sendmux/skills"
primaryEnv: "SENDMUX_API_KEY"
envVars:
- name: "SENDMUX_API_KEY"
required: false
description: "Optional Sendmux API key or scoped agent token used by CLI, SDK, HTTP, or MCP examples."
- name: "SENDMUX_MBX_KEY"
required: false
description: "Optional Sendmux mailbox key for Mailbox and send-capable mailbox workflows."
---

# Sendmux send email

## ClawHub account note

This ClawHub skill connects OpenClaw agents to Sendmux. Some workflows require a Sendmux account and an appropriate Sendmux API key or agent token. Sendmux account usage is external to ClawHub; do not ask users to paste secrets into chat.

Use this skill when the user is ready to send outbound email through Sendmux or needs code/commands for sending.

## Safety first

- Do not ask the user to paste an API key.
- Do not invent recipients, sender addresses, subject lines, or body content.
- Send only after the user supplies or confirms every recipient and message.
- For batch sends, confirm the full recipient/message set before calling a send tool.
- Use a send-capable `smx_mbx_` key, owner-approved Sending-resource `smx_agent_` token, or REST OAuth grant with Sending access and `email.send` for the Sending HTTP API. SMTP requires a send-capable API key; OAuth access tokens are not SMTP or IMAP passwords.

For an agent-profile before/after approval answer, cover the complete lifecycle:

| State | Required explanation |
| --- | --- |
| Before owner acceptance and sending approval | The durable credential is read/receive-only, sends fail closed, and the self-registered inbox is capped at 500 MiB. |
| After sending approval | Storage rises to at least 5 GiB. The CLI automatically exchanges for a one-hour delegated `email.send` token and caches it only until near expiry; the sender supplies one stable `--idempotency-key` per logical send. |
| After sending revocation | Sending becomes unavailable again, but revocation does not itself change the current inbox storage allocation. |

Sending approval supplies the required authority; it does not guarantee that a later request will pass validation or be accepted for delivery.

## Choose the send path

| User task | Efficient default |
| ----------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------- |
| One outbound email | `POST /emails/send`, MCP `sending_send_email`, CLI `sending:send`, or SDK `sendingSe

_meta.json

{
  "ownerId": "kn77z51yqhw8mt9vjfkpt8w74989rfb3",
  "slug": "sendmux-send-email",
  "version": "1.0.11",
  "publishedAt": 1790915001981
}

skill-card.md

## Description:

Send one or many emails through Sendmux using approved mailbox or agent credentials, idempotency keys, attachments, MCP, CLI, SDKs, or HTTP.

This skill is ready for commercial/non-commercial use.

## Publisher:

[sendmux.ai](https://clawhub.ai/user/sendmux.ai)

### License/Terms of Use:

MIT-0

## Use Case:

OpenClaw users and developers use this skill to prepare or send individual and batch emails through Sendmux, including messages with attachments, after confirming the full message details.

### Deployment Geography for Use:

Global

## Known Risks and Mitigations:

Risk: Outbound messages could reach an unintended recipient or disclose sensitive content or attachments.

Mitigation: Review and confirm the sender, every recipient, subject, body, and attachment before each send or batch.

Risk: Sendmux credentials could be exposed or grant broader sending access than needed.

Mitigation: Use scoped credentials and keep secrets out of chat.

## Reference(s):

- [ClawHub skill release](https://clawhub.ai/sendmux.ai/skills/sendmux-send-email)
- [Sendmux skills homepage (declared in skill metadata)](https://github.com/Sendmux/skills)

## Skill Output:

**Output Type(s):** [Guidance, Shell commands, Code]

**Output Format:** [Markdown with JSON, shell, HTTP, and TypeScript examples]

**Output Parameters:** [1D]

**Other Properties Related to Output:** [Sending requires confirmed message details and appropriate Sendmux authorization.]

## Skill Version(s):

1.0.11 (source: ClawHub release metadata; skill frontmatter: 1.7.1)

## Ethical Considerations:

Users should evaluate whether this skill is appropriate for their environment, review any generated or modified files before relying on them, and apply their organization's safety, security, and compliance requirements before deployment.

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