Sidemail (sidemail/sidemail-mcp-server) is an MCP server listed on the M8ven Trust Index. It scores 68 out of 100, grade C. It declares 19 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Caution
68/100

Sidemail

Sidemail.io's official MCP Server. Provides Model Context Protocol (MCP) integration for Sidemail.io, enabling programmatic access to Sidemail's transactional emails, contacts, domains, and Messenger features for product updates and newsletters via MCP agent mode (in VS Code, Claude, Cursor and other MCP clients).

→ sidemail/sidemail-mcp-server· 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.

How we verified

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Who stands behind it

sidemail

Source: mcp.so

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Install from

mcp.sonot scored here

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
⚠️
Known vulnerabilities in dependencies: 2 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.
🔐
You'll be asked for 1 credential: SIDEMAIL_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// tools this server exposes19 tools

These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.

list-domains

List all sending domains (Sidemail API)

create-domain

Create a new sending domain (Sidemail API)

delete-domain

Delete a sending domain (Sidemail API)

list-messenger-drafts

List Messenger drafts (Sidemail Messenger API)

get-messenger-draft

Get a Messenger draft by ID (Sidemail Messenger API)

create-messenger-draft

Create a Messenger draft (Sidemail Messenger API). Messenger is a tool for sending newsletters / broadcasts to contacts inside Sidemail.

update-messenger-draft

Update a Messenger draft (Sidemail Messenger API)

delete-messenger-draft

Delete a Messenger draft (Sidemail Messenger API)

list-groups

List all contact groups (Sidemail API)

create-group

Create a contact group (Sidemail API)

update-group

Update a Group (Sidemail Messenger API)

create-or-update-contact

Create or update a contact (Sidemail API). It's partial update, so you can provide only the fields you want to change. If the contact does not exist, it will be created.

query-contacts

Query contacts with advanced filtering, searching, and pagination (Sidemail API). If the query parameter is empty or not provided, it lists all contacts. The contact data are returned sorted by creation date, with the most recent contact appearing first.

find-contact

Find a contact by email address (Sidemail API)

delete-contact

Delete a contact by email address (Sidemail API)

send-email

Send a transactional email (Sidemail API). This tools can only be used for sending transactional emails, not marketing emails (for that, use the Messenger tool).

query-emails

Query emails with filtering and pagination (Sidemail API). If the query parameter is empty or not provided, it lists all emails. The email data are returned sorted by creation date, with the most recent emails appearing first.

get-email

Retrieve an email by its ID (Sidemail API)

delete-email

Delete a scheduled email by ID (Sidemail API). Only emails not yet sent can be deleted.

// known CVEs in dependencies2 high

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

high@modelcontextprotocol/sdk@1.8.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.8.0GHSA-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.
configSIDEMAIL_API_BASE
🔐 secretSIDEMAIL_API_KEY"": "${input:sidemail-key}",
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

19/19 tools missing one or more hints — list-domains (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); create-domain (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); delete-domain (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +16 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 inputs are validated

12/19 tool handlers declare input schemas (63%)

Declare an inputSchema with zod/joi/yup on every tool definition.

Tests exist

No test files found

Add tests that exercise each declared tool.

Production dependencies are patched

0 critical, 2 high severity in production deps — @modelcontextprotocol/sdk@1.8.0 (high), @modelcontextprotocol/sdk@1.8.0 (high)

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

Dependency freshness

1/3 production deps stale: node-fetch@2023-11-30 (2.5y)

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 5 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
[![M8ven Verified](https://m8ven.ai/badge/mcp/sidemail/sidemail-mcp-server?variant=verified)](https://m8ven.ai/mcp/sidemail/sidemail-mcp-server)
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commit: f54f2fb65739b17a87703fb80ea5a747ff411114
code hash: 06911ff9248c7e04b536b423fd743ff6e8ec8f14d46a7bc40cfdaf88ae2e3a95
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