posteo-mcp (trustworthy-tech/posteo-mcp) is an MCP server listed on the M8ven Trust Index. It scores 74 out of 100, grade C. It declares 8 tools. No publisher has claimed this listing.

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C
Emerging
74/100
2 days ago

posteo-mcp

Zero-dependency, security-focused MCP server for Posteo email.

→ trustworthy-tech/posteo-mcp· listed on github_repo_search

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

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Who stands behind it

trustworthy-tech

Source: github_repo_search

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Install from

GitHub

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configPOSTEO_DRAFTS_FOLDERAccount-specific Drafts folder name
configPOSTEO_KEYCHAIN_SERVICEmacOS Keychain service name
configPOSTEO_MODEread-only, drafts, or manage
configPOSTEO_TRASH_FOLDERAccount-specific Trash folder name
configPOSTEO_USERNAMEFull Posteo login address
// quality suggestions

Tool test coverage

6/8 tools referenced in tests (75%)

Write tests that reference each tool by name so every tool has at least one test.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 1 concrete improvement we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/trustworthy-tech/posteo-mcp)](https://m8ven.ai/mcp/trustworthy-tech/posteo-mcp)
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commit: 9fe845eccaad4313c6f1bd27006e7ce47832bcf6
code hash: ae6839e6804319ff89432179d2259953ce0372bf0aae179cde25e9288961a6b4
verified: 9/9/2026, 8:59:27 PM
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