Best Alternatives to Hail

SenderKit

Runtime: npx

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

Mailbuttons

Runtime: npx

Governed email for AI agents: sandbox inboxes, server-side policy gate, tamper-evident audit.

Abnormal Security MCP

Runtime: npx

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

HQBase

Runtime: Remote (SSE)

Connect AI agents to your self-hosted HQBase shared email workspace.

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.

Threadline MCP

Runtime: npx

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

Slack MCP Server

Runtime: npx

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

AgentLine

Runtime: Remote (SSE)

Give AI agents a phone number. Voice calls, SMS, and phone number management for MCP clients.

Dial

Runtime: Remote (SSE)

Communication stack for AI agents: SMS, AI voice calls, phone numbers, and account events.

Anima

Runtime: Remote (SSE)

Identity for AI agents: real email, a US number that receives SMS codes, voice, and a vault.

Sendmux MCP

Runtime: uvx

Email inbox API for AI agents with MCP tools for Mailbox, Management, and Sending APIs.

Atomic Mail

Runtime: npx

Programmable email inbox for AI agents — JMAP, PoW auth, stdio MCP server.