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Mailosaur is an email and SMS testing platform that lets developers capture, inspect, search, and analyze messages sent by applications. Use it to automate email verification flows, test deliverability (SPF/DKIM/DMARC/SpamAssassin), and manage virtual inboxes (servers) for isolated test environments.
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Browse all toolsDomain knowledge for Mailosaur — workflow patterns, data models, and gotchas for your AI agent.
Mailosaur is an email and SMS testing platform for capturing, inspecting, and analyzing messages during development and CI/CD.
knyrbtfl). Each server has a unique catch-all address *@SERVER_ID.mailosaur.net. Any email sent to that domain is captured.user@SERVER_ID.mailosaur.net → search messages by sentTo → extract verification link from html.links.server is required for listing and searching messages. Discover the server id from the server directory before message operations.Create a new Mailosaur server (virtual inbox). Returns the new server with its ID. Send test emails to any-address@SERVER_ID.mailosaur.net to capture ...
Permanently delete ALL messages and attachments in a server. Useful for cleaning up between test runs. This cannot be undone.
Permanently delete a single message and its attachments. This cannot be undone.
Permanently delete a Mailosaur server and all its messages and attachments. This cannot be undone.
Forward an email message to a verified external email address. You must provide at least one of 'html' or 'text' as the forwarding body. Optionally ov...
Generate a one-time password (OTP/TOTP) from a base32-encoded shared secret. Use this to automate 2FA verification flows in tests. Returns the current...
Run a deliverability analysis on a received message. Returns SPF, DKIM, DMARC results, blocklist checks, content flags, DNS records, and a SpamAssassi...
Download the raw EML source of an email message. Returns the full RFC 5322 email source including all MIME headers, which is useful for debugging deli...
Get Mailosaur messages. Pass message_id for full message details (HTML body, text body, links, images, attachments, SMTP headers). Omit message_id to ...
Retrieve the SMTP/POP3 password for a server. Use this password with the server ID as username to configure applications that send email via SMTP (hos...
Get Mailosaur servers (virtual inboxes). Pass server_id to retrieve a single server, or omit to list all servers with their IDs, names, and message co...
Retrieve current Mailosaur account usage limits and consumption. Shows limits and current usage for servers, users, email, SMS, previews, and phone nu...
Retrieve the last 31 days of usage transactions. Shows daily counts of emails received, emails sent, SMS, previews, and screenshots.
Reply to an email message. The original message must have been received from an external sender (not created via send_email with send=false). You must...
Search for messages matching criteria within a Mailosaur server. Filter by sender, recipient, subject, or body text. Returns message summaries — use g...
Send an email from a Mailosaur server. The recipient must be a verified external email address in your Mailosaur account. Set 'send' to false to creat...
Update a Mailosaur server (rename an inbox). Returns the updated server.
Mailosaur is an email and SMS testing platform that lets developers capture, inspect, search, and analyze messages sent by applications. Use it to automate email verification flows, test deliverability (SPF/DKIM/DMARC/SpamAssassin), and manage virtual inboxes (servers) for isolated test environments. It provides 17 tools that AI agents can use through the Model Context Protocol (MCP).
Add the MCPBundles server URL to your MCP client configuration (Claude Desktop, Cursor, VS Code, etc.). The URL format is: https://mcp.mcpbundles.com/bundle/mailosaur. Authentication is handled automatically.
Mailosaur provides 17 tools that can be called by AI agents, along with a SKILL.md that gives your AI agent domain knowledge about when and how to use them.
Mailosaur uses API Key. Mailosaur requires credentials. Connect via MCPBundles and authentication is handled automatically.
Connect Mailosaur to any MCP client in minutes
Model Context Protocol lets AI tools call external capabilities securely through a single URL. This bundle groups tools behind an MCP endpoint that many clients can use.
Skip the manual setup! Use the .mcpb file format for one-click installation. Check the Claude Desktop tab for setup instructions.
Select ChatGPT, Cursor, Claude Code, or another tab for copy-paste config.
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