SMTP
Runs locallyCredentials listedSource code linkedUpdated 2026-09-03
io.github.ni-c/smtp-mcp · Registry status: active
At a glance
MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation
Vendor's own description, untranslated and unverified
- Execution location
- local
- Required secrets declared
- yes
- Declared version and change
0.1.0· Changed in the registry 2026-09-03- Repository as declared
- github.com/ni-c/smtp-mcp
- Configuration
- can be built from the disclosed start template
- Runs
- local
- Credentials
- true
- Source updated
- 2026-09-03
- Setup
- Template available
- Registry name
io.github.ni-c/smtp-mcp- Package coordinate
npm:@ni-c/smtp-mcp- Declared version
0.1.0- Listed in the registry
- 2026-09-03
- Changed in the registry
- 2026-09-03
- First seen by tracevero
- 2026-09-04
- Vendor's website
- https://smtp-mcp.ni-c.de
Evidence for this page · Source: MCP-Register · collected on 2026-09-04
Every value below comes from it. Where one differs, its origin is stated on its row. What the confidence levels mean
Measured values
| Required secrets declared | yes Original data – Required secret variables (raw): SMTP_PASSWORD, SMTP_PASSWORD Original data – Required secret headers (raw): confirmed absent Source: MCP-Register · collected on 2026-09-04 · derived |
|---|---|
| Execution location | local Original data – Transports (raw): stdio, stdio Source: MCP-Register · collected on 2026-09-04 · derived |
| Path argument present | no Original data – Path arguments (raw): confirmed absent Original data – Path environment variables (raw): confirmed absent Source: MCP-Register · collected on 2026-09-04 · derived |
| Repository URL listed | yes Original data – Repository (raw): https://github.com/ni-c/smtp-mcp Source: MCP-Register · collected on 2026-09-04 · derived |
| Field of use, derived from the vendor description | Email Original data – Description (raw): MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation Source: MCP-Register · collected on 2026-09-04 · derived |
| Declared version | 0.1.0 Source: MCP-Register · collected on 2026-09-04 · self-declared |
What is measured is what a manifest declares, not what a piece of software does. This registry fetches no repository URL, no endpoint and no package index; nothing here is verified. Which value comes from which source, and by which rule it was formed, is set out in the Methodology.
Related categories
- MCP servers for email569
- MCP servers with declared required secrets4,638
- Locally executed MCP servers12,980
- MCP servers with a repository URL20,551
- Local MCP servers with a repository URL12,325
- Local MCP servers with declared required secrets3,147
- MCP servers with required secrets and a repository URL3,803
- MCP servers available as a package only11,385
Source data24
All 24 values in this block: self-declared.
| Description (raw) | MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation |
|---|---|
| Environment variables (raw) | SMTP_HOST, SMTP_PORT, SMTP_TLS, SMTP_USER, SMTP_PASSWORD, SMTP_FROM, SMTP_ALLOW_SEND, SMTP_ALLOWED_RECIPIENTS, SMTP_MAX_RECIPIENTS, SMTP_MAX_SENDS_PER_HOUR, SMTP_MAX_MESSAGE_BYTES, SMTP_MAX_ATTACHMENT_BYTES, SMTP_ATTACHMENT_DIR, SMTP_ATTACHMENT_TYPES, SMTP_SIGNATURE, SMTP_AUDIT_LOG, SMTP_ALLOW_TOOLS, SMTP_DENY_TOOLS, SMTP_INSECURE_TLS, SMTP_HOST, SMTP_PORT, SMTP_TLS, SMTP_USER, SMTP_PASSWORD, SMTP_FROM, SMTP_ALLOW_SEND, SMTP_ALLOWED_RECIPIENTS, SMTP_MAX_RECIPIENTS, SMTP_MAX_SENDS_PER_HOUR, SMTP_MAX_MESSAGE_BYTES, SMTP_MAX_ATTACHMENT_BYTES, SMTP_ATTACHMENT_DIR, SMTP_ATTACHMENT_TYPES, SMTP_SIGNATURE, SMTP_AUDIT_LOG, SMTP_ALLOW_TOOLS, SMTP_DENY_TOOLS, SMTP_INSECURE_TLS |
| Required secret variables (raw) | SMTP_PASSWORD, SMTP_PASSWORD |
| Transports (raw) | stdio, stdio |
| Path arguments (raw) | confirmed absent |
| Repository (raw) | https://github.com/ni-c/smtp-mcp |
| Package registries (raw) | npm, oci |
| Required secret headers (raw) | confirmed absent |
| Path environment variables (raw) | confirmed absent |
| Remote URLs (raw) | confirmed absent |
| Remote hosts (raw) | confirmed absent |
| Registry status message (raw) | confirmed absent |
| First listed in the registry (raw) | 2026-09-03 |
| Last changed in the registry (raw) | 2026-09-03 |
| Schema version of the raw record (raw) | https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json |
| Delivery form (raw) | package |
| Repository platform (raw) | github |
| Repository subfolder (raw) | confirmed absent |
| Package identifiers (raw) | @ni-c/smtp-mcp, ghcr.io/ni-c/smtp-mcp:0.1.0 |
| Package versions (raw) | 0.1.0 |
| Runtime hints (raw) | confirmed absent |
| Environment variable formats (raw) | boolean, number, string |
| Environment variable descriptions (raw) | SMTP_ALLOWED_RECIPIENTS=Comma-separated addresses and @domains this server may write to. Required with SMTP_ALLOW_SEND=true; "*" allows any. · SMTP_ALLOW_SEND=Set to "true" to register the sending tools. Defaults to false: the server cannot send until it is set. · SMTP_ALLOW_TOOLS=Comma-separated tool names, a prefix with one trailing *, or "essential" for the curated preset. · SMTP_ATTACHMENT_DIR=Directory attachments are read from. Unset means attachments are unavailable. · SMTP_ATTACHMENT_TYPES=Comma-separated content types that may be attached. Defaults to a document and image allowlist. · SMTP_AUDIT_LOG=File the audit lines are appended to, in addition to stderr. · SMTP_DENY_TOOLS=Comma-separated tool names or prefixes to remove, applied after SMTP_ALLOW_TOOLS. · SMTP_FROM=The only sender this server will use, e.g. "Name <person@example.net>". There is no from parameter. · SMTP_HOST=Hostname of the SMTP server, e.g. smtp.example.net. · SMTP_INSECURE_TLS=Set to "true" to accept self-signed certificates. Prefer a proper internal CA. · SMTP_MAX_ATTACHMENT_BYTES=Maximum size of a single attachment. Default 5242880. · SMTP_MAX_MESSAGE_BYTES=Maximum size of the composed message. Default 10485760. · SMTP_MAX_RECIPIENTS=Maximum distinct recipients across To, Cc and Bcc in one message. Default 10. · SMTP_MAX_SENDS_PER_HOUR=Sliding hourly cap on messages sent. Default 20. · SMTP_PASSWORD=Password or app-specific password for SMTP authentication. · SMTP_PORT=Port. Defaults to 587 for starttls, 465 for implicit, 25 for none. · SMTP_SIGNATURE=Text appended below the standard signature delimiter of every message. · SMTP_TLS=starttls (default), implicit or none. STARTTLS is required, never opportunistic. · SMTP_USER=Username for SMTP authentication. |
| Icon formats (raw) | confirmed absent |
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Changes
| 2026-09-04 | Declared version: – → 0.1.0 |
|---|---|
| 2026-09-04 | Field of use, derived from the vendor description: – → Email |
| 2026-09-04 | Repository URL listed: – → true |
| 2026-09-04 | Path argument present: – → false |
| 2026-09-04 | Execution location: – → local |
| 2026-09-04 | Required secrets declared: – → true |
| 2026-09-04 | Description (raw): – → MCP server that sends mail over SMTP, gated behind an allowlist and a human confirmation |
| 2026-09-04 | Last changed in the registry (raw): – → 2026-09-03 |
| 2026-09-04 | First listed in the registry (raw): – → 2026-09-03 |
| 2026-09-04 | Registry status message (raw): – → – |
These are the 10 most recent changes to this entry. Full history
tracevero · https://tracevero.com/mcp/io-github-ni-c-smtp-mcp