"address validation" matching MCP servers:

Enables email address validation and outbound email status checking for the Xeams on-premise email server via MCP tools.

A CardDAV MCP server that exposes contacts and address books as tools for AI assistants.

Global mailbox and address book for AI agents, enabling asynchronous messaging across machines without requiring simultaneous online presence.

A Model Context Protocol server that enables LLMs to send, edit, and delete Discord messages using webhooks. It supports text content, rich embeds, and thread interactions with strict Zod-based parameter validation.

Email for AI agents. Send and receive as markdown with human oversight.

Give your agent an address: private agent-to-agent messaging, free encrypted file handoffs, and Lightning commerce. Buy, sell, and discover files, data, APIs, and compute on a public marketplace. Non-custodial: buyers pay sellers directly and payment unlocks delivery.

Ephemeral rendezvous for agents: threads with a secret read key and a public write address that expire on time, receipts that outlive them, and an open board where agents that have never met find each other. Local runtime with fifteen MCP tools over stdio, no account, no API key.

Use a fmsg address for a fmsg host. Tools for inbox, threads, send and reply, reactions, attachments, delivery status and wait-for-message over the host's WebSocket so agents can hold conversations with people or other agents. Runs over stdio locally or as a Streamable HTTP endpoint where each user authenticates with their own fmsg API key.

MCP server for Zammad that focuses on workflows the standard Zammad API tooling does not cover well — primarily shared drafts with strict reply-HTML validation, fresh signature rendering and German-localised quote blocks.

Enables sending letters and MICR-encoded checks, managing contacts and templates, and verifying US/Canadian addresses via the PostGrid Print & Mail and Address Verification APIs from Claude.

Enables AI assistants to send emails and SMS messages through the Unosend API. It also supports email validation, domain management, and contact list operations via natural language commands.

Sends messages to Google Chat via webhooks with automatic Markdown to Cards V2 conversion, supporting headers, lists, code blocks, tables, and images with validation and fallback handling.

Provides AI agents with a real email address to send, receive, and manage emails via the Envoi.work platform. It enables seamless email communication, including inbox management and threaded replies, directly within MCP-compatible clients.

MCP server for building and publishing Telegram bot funnels on zaytsv.ru, enabling graph creation, validation, and publication via API.

Enables AI agents to interact with the XMTP decentralized messaging network. Supports sending encrypted messages, managing conversations, and streaming real-time messages to any XMTP-enabled wallet address.

Official mailbox.bot MCP server for AI agents. Send letters, certified mail and postcards, and give an agent its own street address + postal mailbox number. Agent mailboxes are live now at $10/mo in Manhattan Beach, CA. Sandbox keys, approval controls, tracking and webhooks.

Enables sending rich notifications to Discord and/or Slack webhooks with automatic service detection, retry logic, and support for embeds, blocks, and attachments. Provides secure webhook management with comprehensive input validation and rate limiting.

This server enables AI models to send SMS messages and initiate Text-to-Speech calls programmatically using ClickSend's API with built-in rate limiting and input validation.

Enables validation of single or bulk WhatsApp numbers and retrieval of account metadata, such as business status and profile info, via the Bulk WhatsApp Validator API.

Enables interaction with email servers through IMAP protocol for managing emails, folders, and messages. Supports operations like listing folders, retrieving messages, searching, moving, deleting, and managing flags with type-safe validation.