Best Alternatives to Smails

Mailsink

Runtime: npx

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

Email

Runtime: Remote (SSE)

MCP server for Blip disposable email — create inboxes, receive emails, extract OTP codes

Give AI agents full read/write email access via Mozilla Thunderbird. Zero credentials.

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.

Mailbuttons

Runtime: npx

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

UnCorreoTemporal

Runtime: uvx

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

Abnormal Security MCP

Runtime: npx

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

Email for AI agents: read, search, send, organize, and schedule across your inboxes.

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.

Send, receive, monitor and reply to email from AI agents with threaded inbox context.