#mailbox

Sendmux is an email inbox API and email API for AI agents. Use this MCP server to let authorised agents work with Sendmux mailboxes, inbound email, clean JSON parsing, webhooks, outbound sending, provider routing, logs, billing, and team controls. Agents can read mailbox messages, send email, manage domains and mailboxes, inspect usage, and build multi-tenant email workflows without raw IMAP/SMTP plumbing. Learn more: https://sendmux.ai/product/inboxes MCP setup: https://sendmux.ai/docs/guides/mcp

Give Claude its own email address. QMailing exposes real, persistent mailboxes as MCP tools — create mailboxes on demand, send and read emails, manage custom domains, and register webhooks through natural conversation. 12 tools out of the box, scoped revocable tokens, RFC-7807 error envelopes, signed webhooks. Free tier available; 3 days of Plus on first connect via Claude.

MailboxValidator MCP server validates email addresses using MailboxValidator API to ensure your mailing list is clean and to reduce email bounces during marketing campaigns. With a free MailboxValidator API key, users can query up to 300 emails per month. If more queries are required, users can opt for a paid API plan instead. https://www.mailboxvalidator.com/plans#api

Postal mail API for AI agents. Send letters, certified mail, postcards, and documents from code via MCP, with sandbox keys, webhooks, tracking, proof, and inbound mail context from a business address, PO box, office, home address, or virtual mailbox.

Postal mail API for AI agents. Send letters, certified mail, postcards, and documents from code via MCP, with sandbox keys, webhooks, tracking, proof, and inbound mail context from a business address, PO box, office, home address, or virtual mailbox.