Mailtrap Email Sending MCP (mailtrap/mailtrap-mcp) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: we have no way to read this server ourselves. No publisher has claimed this listing.

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C
Caution
65/100
1 month ago

Mailtrap Email Sending MCP

An MCP server that provides a tool for sending transactional emails via Mailtrap

→ mailtrap/mailtrap-mcp· listed on mcp_so

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

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Who stands behind it

mailtrap

Source: mcp.so · also listed on modelscope

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mcp.somodelscope

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// key findings
⚠️
Known vulnerabilities in dependencies: 3 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
✅
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.
// known CVEs in dependencies3 high

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.18.2GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.18.2GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.18.2GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// 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.
configDEFAULT_FROM_EMAILDefault sender email when from is not provided to send-email or send-sandbox-email. Enables switching sender per call via the from parameter.
configMAILTRAP_TEST_INBOX_IDDefault test inbox ID for sandbox tools when test_inbox_id is not provided. Enables switching between inboxes per call via the test_inbox_id parameter.
// quality suggestions

All four hints declared on every tool

105/105 tools missing one or more hints — send-email (missing: readOnlyHint, idempotentHint, openWorldHint); batch-send-transactional-email (missing: readOnlyHint, idempotentHint, openWorldHint); batch-send-bulk-email (missing: readOnlyHint, idempotentHint, openWorldHint), +102 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool test coverage

Only 0/105 tools referenced in tests (0%)

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

Production dependencies are patched

0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.18.2 (high), @modelcontextprotocol/sdk@1.18.2 (high)

Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.

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 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
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commit: 574eb72099ad50de6f61476c3e6cdcad3f2d685b
code hash: 83553779358c82c55d2e417229ad13d5e000ea4bccaa7f8b0a9d6c6062caf5b9
verified: 8/7/2026, 2:50:48 AM
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