openmail
Open-source Customer.io alternative — email marketing automation with full API + native MCP server for AI agents. Self-hosted, no per-seat pricing.
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
Verified is a snapshot. Live keeps it current, and builds your track record.
⚡ Connect GitHub → continuous verification on every pushwhy connect →Who stands behind it
ShadowWalker2014
Source: github_code
Claim it to get a verified publisher badge, a free copy of our full audit findings, and direct contact for any high-priority issues we find. Or connect your repo for our deepest verification, Live Monitored: read-only, revoke anytime. What we access →
Install from
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.
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.
get_analyticsGet workspace analytics overview for the last 30 days: contacts, sends, open rate, click rate, unsubscribes.
get_broadcast_analyticsGet detailed analytics for a specific broadcast.
list_assetsList all uploaded assets (images, videos, PDFs) in the workspace. Each asset includes a `proxyUrl` that is stable and can be embedded directly in email HTML using an <img src='...'> tag.
get_assetGet details of a single asset including its stable `proxyUrl` for embedding in emails.
upload_asset_from_urlUpload an image or file from any public URL into the workspace asset library. The API fetches the file server-side and stores it in S3. Returns an asset object with a stable `proxyUrl` — use this URL in email HTML: <img src="{proxyUrl}" alt="..."> Supported types: JPEG, PNG, GIF, WebP, SVG, MP4, …
upload_asset_base64Upload a file from base64-encoded content into the workspace asset library. Use this when you have file content in memory (e.g. a generated image). Returns a stable `proxyUrl` for embedding in email HTML. Supported MIME types: image/jpeg, image/png, image/gif, image/webp, image/svg+xml, video/mp4, …
delete_assetPermanently delete an asset from storage and the asset library. Warning: any emails using this asset's URL will show a broken image.
list_broadcastsList all broadcasts in the workspace including their status (draft, sending, sent, failed).
get_broadcastGet a single broadcast by ID, including its current status, subject, content, and recipient count.
create_broadcastCreate a new broadcast email campaign (starts in draft status — call send_broadcast when ready). To embed images, first use upload_asset_from_url to get a proxyUrl, then use it in htmlContent: <img src="{proxyUrl}" alt="description" style="max-width:100%;display:block"> Either provide htmlContent …
update_broadcastUpdate a broadcast that is still in draft status. Cannot update a broadcast that is sending or has already sent.
schedule_broadcastSchedule a draft broadcast to send at a specific future date/time.
send_broadcastImmediately send a broadcast. The broadcast must be in draft status. This action is irreversible once started.
delete_broadcastDelete a broadcast. Only draft and scheduled broadcasts can be deleted — a broadcast that is actively sending cannot be deleted.
list_campaignsList all automation campaigns.
create_campaignCreate an automation campaign triggered by an event or segment.
update_campaignUpdate a campaign's name, description, or status.
pause_campaignPause an active campaign. Contacts already in the campaign will not receive further emails until it is reactivated.
list_contactsList contacts in the workspace. Supports search and pagination.
create_contactCreate or update a contact by email (upsert).
update_contactUpdate contact attributes by contact ID.
delete_contactPermanently delete a contact.
track_eventTrack a customer event (e.g. signed_up, upgraded, churned).
list_segmentsList all contact segments in the workspace.
create_segmentCreate a new contact segment with conditions.
list_templatesList all email templates in the workspace.
create_templateCreate a reusable email template that can be used by broadcasts and campaigns. To include images, first upload them with upload_asset_from_url and use the returned proxyUrl: <img src="{proxyUrl}" alt="..." style="max-width:100%;display:block"> The proxyUrl is permanently public and safe for any em…
update_templateUpdate an existing email template. Only the fields you provide will be changed.
delete_templatePermanently delete an email template. Broadcasts referencing this template will lose their template association.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
Hono JWK Auth Middleware has JWT algorithm confusion when JWK lacks "alg" (untrusted header.alg fallback)
hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard
Hono JWT Middleware's JWT Algorithm Confusion via Unsafe Default (HS256) Allows Token Forgery and Auth Bypass
Hono Improper Authorization vulnerability
Hono vulnerable to arbitrary file access via serveStatic vulnerability
API_URLLOG_LEVELOPENMAIL_DOCS_URLPORTTool 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
29/29 tools missing one or more hints — get_analytics (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_broadcast_analytics (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_assets (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +26 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.
README present
No README found
Add a README.md describing the server and its tools.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tool test coverage
21/29 tools referenced in tests (72%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 5 high severity in production deps — hono@4.7.4 (high), hono@4.7.4 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Domain consistency
npm scope @openmail doesn't match GitHub owner shadowwalker2014
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
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.
[](https://m8ven.ai/mcp/shadowwalker2014/openmail)?variant=verified from the URL.Vetting this one by hand? Tool Check is an MCP that scores other MCPs. Add it once and ask Claude, ChatGPT, or any MCP client to grade a server, surface CVEs, check the publisher, and suggest safer alternatives — before you install.
https://m8ven.ai/api/mcp/tool-check