Proton Mail (unofficial)
Unofficial Proton Mail MCP — send, read, search & organize email over SMTP and IMAP
Using Proton Mail (unofficial) in Claude, Cursor, Gemini CLI, Cline, or Zed?
MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).
Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less
curl -fsSL https://mcpindex.ai/install.sh | shSemantic screen found no manipulation pattern in the description. Conformance probe not yet run.
mcpindex.integrity.descriptionpassINFOevidence“Declared capabilities, no hidden instructions”via static_description
- - Semantic screen only - the deterministic conformance probe has not run on this server
- - Confidence is reported but not yet calibrated (v1)
- - Screen reads the tool description, not the live behavior
- - advisory
- - registry description only no input schema
- - screen model 8b
Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.
Own this server? Screen its description →
A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.
[](https://mcpindex.ai/server/io-github-sethbang-proton-mail-mcp)<a href="https://mcpindex.ai/server/io-github-sethbang-proton-mail-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-sethbang-proton-mail-mcp" alt="mcpindex verdict" height="20" /></a>PROTONMAIL_USERNAMEYour Proton Mail email address
PROTONMAIL_PASSWORDYour Proton Mail SMTP password (not your login password; generate one in Proton settings)
PROTONMAIL_HOSTSMTP host
PROTONMAIL_PORTSMTP port
PROTONMAIL_SECUREUse TLS for SMTP (true for port 465)
IMAP_HOSTProton Mail Bridge IMAP host (required for read/search tools)
IMAP_PORTProton Mail Bridge IMAP port
IMAP_SECUREUse TLS for IMAP
IMAP_USERNAMEProton Mail Bridge username (falls back to PROTONMAIL_USERNAME)
IMAP_PASSWORDProton Mail Bridge password (falls back to PROTONMAIL_PASSWORD)
READONLYDisable all mutating tools (send, move, delete, flags, labels, bulk ops, folder/label management)
RESTRICT_OUTBOUND_TO_SELFRefuse live sends to any recipient other than PROTONMAIL_USERNAME (for throwaway/QA accounts)
ALLOW_FILE_DOWNLOAD_DIRAllowlist directory enabling download_attachment.saveTo; when unset, attachments return as inline base64
ALLOW_EMPTY_FOLDERRegister the empty_folder tool (not recommended)
DEBUGEnable verbose logging to stderr
Turn a written schedule into a live calendar link people subscribe to in Apple, Google, Outlook.
Search companies, enrich contacts, and reveal emails and phones from your AI agent.
Send emails, track events, and manage contacts with MailJunky.