Best Alternatives to Email

UnCorreoTemporal

Runtime: uvx

Temporary email for AI agents: create inboxes, wait for emails, extract OTPs, verify signups.

Smails

Runtime: npx

Disposable email for AI agents: create a throwaway inbox and read verification emails over MCP.

Mailsink

Runtime: npx

Disposable inboxes for AI agents and CI: catch the verification email, read the OTP or link.

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.

Task-scoped email inboxes for AI agents: read mail, extract verification codes, and reply.

Disposable email inboxes for AI agents — create addresses and read messages, codes, attachments.

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 Emails

Runtime: npx

Read, search, send, organize, draft and schedule email across your inboxes from any MCP client.

Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links.

CryptoAgentMail

Runtime: Remote (SSE)

Hosted email MCP for AI agents with inboxes, send/receive, memory, recovery, and credits.

Threadline MCP

Runtime: npx

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