## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.SIGN UP
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.LOG IN
Connect Codex to Mailersend MCP. Add a new sending domain for your app, list all smtp users for our domain, and more using natural language, with authentication handled for you.
MailerSend is a transactional email platform for developers to send, receive, and track emails via API. It provides reliable deliverability, analytics, and easy integration for your apps.
Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With the Mailersend MCP integration, Codex can create sending domains and SMTP users, list sent messages, check SMS activity, browse email templates, and manage webhooks, all without leaving the terminal or the app, whichever you prefer.
For exact tool slugs and parameter tables, see the tool catalog in the Composio docs.
Apart from a managed and hosted MCP server, you will get:
Run this command in your terminal to add the Composio MCP server to Codex.
It will initiate the authentication in a browser window, authorize Codex to access your Composio account.
To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.
codex mcp login composioRun codex mcp list to confirm Composio appears as a registered MCP server.
codex mcp listCodex App follows the same approach as VS Code.
{ "x-consumer-api-key" = "ck_*******" }.
.codex/config.toml[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }Ask Codex for a Mailersend task. The first time, Composio asks you to connect your Mailersend account.
For example, ask it to:
The Mailersend MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailersend account. It provides structured and secure access to your transactional email infrastructure, so your agent can perform actions like sending emails, managing domains, configuring webhooks, and monitoring API usage on your behalf.
You've successfully integrated Mailersend with Codex using Composio's MCP server. Now you can interact with Mailersend directly from your terminal, VS Code, or the Codex App using natural language commands.
Key benefits of this setup:
Next steps:
Every Mailersend action and event your agent gets out of the box.
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Gmail is Google's email service with powerful spam protection, search, and G Suite integration. It keeps your inbox organized and makes communication fast and reliable.
Outlook is Microsoft's email and calendaring platform for unified communications and scheduling. It helps users stay organized with powerful email, contacts, and calendar management.
Slack is a channel-based messaging platform for teams and organizations. It helps people collaborate in real time, share files, and connect all their tools in one place.
Gong is a platform for video meetings, call recording, and team collaboration. It helps teams capture conversations, analyze calls, and turn insights into action.
Managed auth, hosted MCP servers, and every Mailersend tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building