sendmux-send-email SKILL.md skillA
sendmux-send-email from sendmux/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sendmux/skills/sendmux-send-email@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sendmux/skills
- Path
plugins/sendmux/skills/sendmux-send-email/SKILL.md- Versions recorded
- 6
- Latest version
- v1.0, committed Oct 13, 2026
- First version recorded
- Aug 31, 2026
- Size
- 12,638 bytes
- Repository stars
- 18
- License
- a license file GitHub does not identify
Use when a user needs advice or implementation help for sending one or many emails through Sendmux: choose the HTTP Sending API versus SMTP, design single or batch sends, attach files, apply idempotency, or inspect send results through MCP, CLI, SDK, or direct HTTP. Not for initial credential, API-key, OAuth, or profile setup—use sendmux-getting-started; not for reading, searching, syncing, or triaging an inbox—use sendmux-mailbox-agent.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Sendmux send email 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. | …
Read the whole file at its exact version.
How to install
mdr add sendmux/skills/sendmux-send-email@sha256:5ce969d5ba7a8380The line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_dre4fplsyjoxa6qw)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Aug 31, 2026 and Oct 13, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-10-13 | f7da88a | 12,638 B | A | view · diff |
| v1.0 | 2026-09-15 | 3de00a3 | 12,316 B | A | view · diff |
| v1.0 | 2026-09-11 | 4b98e93 | 9,503 B | A | view · diff |
| v1.0 | 2026-09-01 | dba9ca4 | 9,033 B | A | view · diff |
| v1.0 | 2026-09-01 | fb0f3a5 | 9,008 B | A | view · diff |
| v1.0 | 2026-08-31 | e2834ee | 8,999 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12638 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sendmux/skills · 18 stars · license a license file GitHub does not identify · pushed 2026-10-15 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dre4fplsyjoxa6qw GET https://markdownregistry.com/api/v1/resolve?ref=sendmux/skills/sendmux-send-email GET https://markdownregistry.com/api/v1/blob/5ce969d5ba7a83803225b2f7e1e67ccd6d41858d352da0628d79a92f76dd9178
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.