Best Alternatives to Justcall MCP Server

Getpoststack MCP

Runtime: npx

EU-hosted MCP server for sending email, managing contacts, building templates, and checking deliverability through PostStack.

ConnectMachine

Runtime: Remote (SSE)

ConnectMachine MCP lets an agent manage your digital business-card contacts, events, and networks in natural language, over a hosted, OAuth-authenticated endpoint with 48 tools.

MCP Mailtrap

Runtime: npx

MCP server for the Mailtrap email platform — analytics, sending, contacts, sandbox

Kudosity

Runtime: npx

Send SMS, MMS and WhatsApp, manage contacts and webhooks, from AI agents.

Qr Agent Core

Runtime: npx

Create, retarget, style, and track dynamic QR codes through an MCP server with 11 QR types and bulk operations.

Sendraven MCP Server

Runtime: npx

Email for AI agents: send, read replies as threads, run campaigns, with per-key limits.

Omnicord

Runtime: npx

Manage Discord servers through MCP with messaging, moderation, diagnostics, and additive server building.

MCP Server

Runtime: npx

MCP server for sending and tracking physical postcards worldwide, including bulk delivery and webhook notifications.

MCP Server

Runtime: npx

Email MCP server enabling AI agents to send/receive markdown email with configurable human oversight and cryptographic identity.

Signal MCP

Runtime: uvx

Connects AI agents to Signal for local messaging, history search, contacts, groups, attachments, and account management.

Slack MCP Server

Runtime: Remote (SSE)

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

MCP Discord Bridge

Runtime: npx

MCP server that lets AI assistants manage Discord channels, messages, members, roles, threads, webhooks, forums, and moderation.