Zerosmtp

Local stdio MCP server for Zerosmtp, a free SMTP relay that accepts a username and password for devices that cannot use OAuth 2.0.

What you can do

• The listing provides no tool list, instructions or README, so the exact tools are unknown.
• Based on the description, it relates to sending mail through a free SMTP relay that authenticates with a username and password instead of OAuth 2.0.
• It is intended for devices or clients that cannot perform OAuth 2.0 sign-in.

When to use it

Consider it if you need an assistant to work with an SMTP relay that uses plain username and password credentials, for example on a device or client that cannot do OAuth 2.0. Because no tools are documented, verify what it actually exposes before relying on it.

Requirements

Runs as a local process over stdio, installed from the npm package zerosmtp-mcp, so a Node.js runtime is needed. The manifest declares no authentication, environment variables or headers, but the relay itself is described as taking a username and password, so credentials are likely needed and must be supplied some other way.