--- title: "Sidemail MCP server" url: "https://martechdb.com/vendors/sidemail" markdown_url: "https://martechdb.com/vendors/sidemail.md" api_url: "https://martechdb.com/api/v1/vendors/sidemail.io" updated: "2026-10-17" --- # Sidemail MCP server Yes. Sidemail publishes an official MCP server at https://api.sidemail.io/mcp. It's hosted. It offers 43 tools. We last checked it on 1 Nov 2026. MartechDB lists only servers the vendor publishes itself, never community servers. **Key facts:** As of 1 Nov 2026, Sidemail's official MCP server scores 65/100 (provisional) on MartechDB's Agent Readiness Index (v1.1). It answered 15 of our 15 checks in the last 90 days and has 43 tools named in its documentation. - Website: [sidemail.io](https://sidemail.io) - Categories: [Email delivery & deliverability](https://martechdb.com/categories/email-delivery-deliverability.md) ## Review Sidemail's MCP server scores 65/100 on MartechDB's Agent Readiness Index: easy to connect an AI agent to, with a few gaps. The good: - Hosted by Sidemail: connect by URL, with nothing to install - Documented, with 43 tools known - Answered 100% of our checks in the last 90 days Not checked yet: how you sign in; what agent access costs. ## Agent Readiness Index: 65/100 (provisional) How friendly Sidemail is to AI agents, from its best official MCP server. Anything not yet researched scores nothing, so this score may rise once it is. Methodology v1.1: https://martechdb.com/methodology. - Official MCP server: 30/30 (Published by the vendor) - Hosted by the vendor: 25/25 (Connect by URL, nothing to install) - OAuth sign-in: pending (Sign-in: see vendor docs) - Documented tools: 10/10 (A docs page, and its tools are known) - Free to start, pay as you go: 0/15 (Not stated by the vendor) ## Sidemail MCP server - Address: https://api.sidemail.io/mcp - Runs: Hosted - Sign-in: Sign-in: see vendor docs (`unknown`) - Official MCP Registry: not listed - Documentation: https://sidemail.io/docs/mcp-server/ - How we know it's official: Documented on Sidemail's own site, at sidemail.io - First seen: 2026-10-17 - Last checked: 2026-11-01 - Recent checks: 7 of the last 7 reachable - Uptime: 100% (15 of 15 checks reachable since 2026-10-18) ### Tools (43) The server needs sign-in before it lists its tools, so these are as the vendor's documentation names them ([source](https://sidemail.io/docs/mcp-server/)), read on 2026-11-01. They may be out of date. - `list-domains`: List all sending domains - `create-domain`: Add a new sending domain - `check-domain`: Check domain verification and DNS status - `setup-domain-mail-from`: Set up custom Mail-From DNS records - `delete-domain`: Remove a sending domain - `get-project`: Get the current project - `create-linked-project`: Create a linked project (API key connections only) - `update-project`: Update project settings and email design - `delete-linked-project`: Delete the current linked project - `list-messenger-drafts`: List Messenger drafts - `get-messenger-draft`: Get Messenger draft by ID - `create-messenger-draft`: Create a Messenger draft - `update-messenger-draft`: Update a Messenger draft - `delete-messenger-draft`: Delete a Messenger draft - `list-groups`: List all contact groups - `create-group`: Create a new contact group - `update-group`: Update a contact group - `delete-group`: Delete a contact group - `create-or-update-contact`: Create or update a contact - `list-contacts`: List contacts with pagination - `query-contacts`: Query contacts with filters - `clean-contacts-batch`: Validate and clean contacts in a group - `find-contact`: Find a contact by email - `delete-contact`: Delete a contact - `send-email`: Send a transactional email - `query-emails`: Query sent emails - `get-email`: Retrieve an email by ID - `delete-email`: Delete a scheduled email - `validate-email`: Validate an email address. Use isDeep: true for SMTP mailbox validation; deep checks can consume validation credits. - `list-templates`: List email templates - `get-template`: Retrieve a template by ID - `create-template`: Create an email template - `update-template`: Update an email template - `list-template-gallery`: List gallery templates - `list-template-fonts`: List supported template fonts - `list-inbound-routes`: List inbound routes - `create-inbound-route`: Create an inbound route - `update-inbound-route`: Update an inbound route - `delete-inbound-route`: Delete an inbound route - `list-received-emails`: List received inbound emails - `get-received-email`: Retrieve a received inbound email by ID - `query-api-request-logs`: Query recent API request logs - `get-api-request-log-stats`: Get API request log statistics ### Connect it Claude Code: ```sh claude mcp add --transport http sidemail https://api.sidemail.io/mcp ``` - Add to Cursor: - Add to VS Code: - Claude.ai and Claude Desktop: Customize, Connectors, "+", Add custom connector, then paste https://api.sidemail.io/mcp - ChatGPT: Settings, Apps, Advanced settings, turn on Developer mode, Create, then paste https://api.sidemail.io/mcp (this usually works only with servers that use self-serve sign-in or none) JSON for Cursor, Windsurf and other clients that connect to hosted servers: ```json { "mcpServers": { "sidemail": { "type": "http", "url": "https://api.sidemail.io/mcp" } } } ``` ## Questions ### Does Sidemail have an official MCP server? Yes. Sidemail publishes its MCP server itself. Sidemail's own documentation describes it. MartechDB only lists servers a vendor publishes, never community copies. ### What is the Sidemail MCP server URL? The address is https://api.sidemail.io/mcp. ### How do I connect Sidemail MCP to Claude, ChatGPT or Cursor? In Claude, add https://api.sidemail.io/mcp as a custom connector (Customize, Connectors, Add custom connector). In Cursor, use the Add to Cursor link on MartechDB's page, or paste the JSON settings into your mcp.json. In Claude Code, run: claude mcp add --transport http sidemail https://api.sidemail.io/mcp ### What can the Sidemail MCP server do? It offers 43 tools, including list-domains, create-domain, check-domain, setup-domain-mail-from and delete-domain (as its documentation names them, read on 1 Nov 2026). ### Is the Sidemail MCP server in the official MCP Registry? No. Sidemail hasn't published it to the official MCP Registry. ### Is the Sidemail MCP server working? Yes. It answered our most recent check. We last checked it on 1 Nov 2026. ### What are the alternatives to Sidemail's MCP server? In Email delivery & deliverability, the most agent-friendly alternatives with an official MCP server are G-Lock Software (92/100), Usebouncer (91/100), Bird (89/100), Unspam.email (88/100) and Resend (85/100). Sidemail scores 65/100 on the same index. ## Change history - 2026-10-17: Added to MartechDB with Sidemail MCP server ## Alternatives to Sidemail's MCP server In Email delivery & deliverability, the most agent-friendly first: - [G-Lock Software](https://martechdb.com/vendors/g-lock-software.md) (glockapps.com), Agent Readiness Index 92/100 - [Usebouncer](https://martechdb.com/vendors/usebouncer.md) (usebouncer.com), Agent Readiness Index 91/100 - [Bird](https://martechdb.com/vendors/bird.md) (bird.com), Agent Readiness Index 89/100 - [Unspam.email](https://martechdb.com/vendors/unspamemail.md) (unspam.email), Agent Readiness Index 88/100 - [Resend](https://martechdb.com/vendors/resend.md) (resend.com), Agent Readiness Index 85/100 ## Get this data - API: `curl https://martechdb.com/api/v1/vendors/sidemail.io` - MCP: `claude mcp add --transport http martechdb https://martechdb.com/mcp`, then ask about Sidemail. - Web page: https://martechdb.com/vendors/sidemail