Best Alternatives to MCP Slack

AgentPing

Runtime: npx

Let your AI agent notify you by email, Slack, Discord, or webhook. One tool: send_notification.

Line Bot MCP Server

Runtime: npx

Verified

Connects an AI agent to LINE Messaging API for messaging, user profiles, quotas, followers, and rich-menu management.

MCP Registry Monitor

Runtime: Remote (SSE)

Monitor MCP registry for new servers - Discord Slack notifications alerts

Abnormal Security MCP

Runtime: npx

Abnormal Security email threats, cases, and reporting in your terminal and your AI agents.

Pickle

Runtime: npx

Free, local MCP server that audits ClickUp, Slack & Teams for work that slipped through.

Slack MCP Server

Runtime: npx

MCP server providing Slack workspace data access with message history, threads, DMs, user info, and optional message posting.

Threadline MCP

Runtime: npx

Agent-to-agent messaging relay. Discover agents, send messages, and receive replies. Zero-config.

SenderKit

Runtime: npx

Build and send email, SMS, and push straight from your AI agent.

Ms 365 MCP Server

Runtime: npx

MCP server providing access to Microsoft 365 services via Graph API with configurable toolsets and authentication.

Agent Cold Email

Runtime: npx

Agent-native cold-email infrastructure: domains, mailboxes, warmup, sequences, replies via 17 tools

MailFathom

Runtime: Remote (SSE)

Security-first, self-hosted email archive with read-only search and cited answers for AI agents.

Mail Index

Runtime: npx

Local-first, read-only MCP server for recall over your Gmail: search, contacts, threads, digests.