Proton mail bridge client: MCP server, setup and security

What Proton mail bridge client does

According to its repository: “Local-first Proton Mail MCP server and CLI via Proton Mail Bridge: search, read, draft, send, triage threads, answer calendar invitations, reply reminders, multiple accounts, and a local SQLite index. Safety presets from read-only to full, with send confirmation and an outbound-to-self mode.”

An MCP server gives an AI agent extra tools it calls during the conversation: the agent reads their description, decides to use them and gets the result back. Proton mail bridge client is listed under Messaging and email, a category of 107 servers in the directory, where it ranks #33 by stars.

Topics declared by the repository: claude, claude-code, email, privacy, proton-bridge, protonmail.

Installing and connecting Proton mail bridge client

No package or remote server is declared in the official MCP registry: you install it from source, following the repository README.

Like any MCP server, you declare it in your client's configuration (Claude Desktop, Claude Code, Cursor, VS Code, Codex…): a name, the command that starts it or its URL, and any environment variables. The client then starts it and lists its tools. Project language: TypeScript.

Security: what to check

An MCP server runs code with the rights you give it, and the model reads its tool descriptions: a malicious or compromised server can hijack the agent. Read the code, or pick a maintained and widely used server, before connecting it.

None of the risk signals we track (system access, secrets, missing licence, abandonment) applies to Proton mail bridge client. That does not replace reading the code.

Good practice: grant only the rights needed (least privilege), require human approval for irreversible actions, and run the AI agent security check.

Project activity and maintenance

Created on March 24, 2026, the googlarz/proton-mail-bridge-client repository has 80 stars and 19 forks, with 1 open issues. It has more stars than 62% of the servers in the directory. It received changes this month.

Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.