Pyfastmail MCP Server
pyfastmail-mcp
PyPI
v0.3.2
Published by pjosols — no publish provenance, so origin is unverified, but the source is public: the repository link below is self-declared yet readable, so you can inspect the code before adopting it.
MCP server for Fastmail — email, contacts, calendar, and files via JMAP, CardDAV, CalDAV, and WebDAV
The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.
1. Threat score — 100 − 0 = 100. What the published surface and source actually contain:
The deterministic scan raised no scored threat in the surface it inspected — the threat score stayed at 100. Capability observations and advisory notes are recorded but never lower it.
2. Client adoption risk — 100 − 7 = 93. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:
| Points | Adoption-risk factor |
|---|---|
| −6 | capability blast radius (high) — client exposure if the model is manipulated |
| −1 | publisher verification (public source) — no provenance, but the source is public and inspectable |
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind a deduction.
Findings 1
critical Completed toxic-flow trifecta across toolsMTC-FLOW-002
This server (without client built-ins) exposes a complete data-exfiltration chain: contacts_get_contact → files_list → mail_forward_email. Untrusted input is ingested, private data is read, and it can be sent to an external sink via the agent composing the tools (→). Static analysis proves the primitive exists, not that a specific run will occur.
Fix: Remove one leg of the trifecta: isolate untrusted-input tools from secret-reading tools and from egress tools, or require human approval between them.
Location: flow contacts_get_contact → files_list → mail_forward_email
Tools 48
Each tool and what it can reach — statically extracted from the published source.
contacts_get_contactingests untrusted inputfiles_getingests untrusted inputfiles_listreads sensitive datamail_download_attachmentingests untrusted inputmail_export_emailingests untrusted inputmail_forward_emailnetwork egressmail_parse_emailingests untrusted inputmail_send_emailnetwork egresscalendar_create_eventno sensitive capabilitycalendar_delete_eventno sensitive capability
Show 38 more tools ↓
calendar_get_eventno sensitive capabilitycalendar_list_calendarsno sensitive capabilitycalendar_list_eventsno sensitive capabilitycalendar_update_eventno sensitive capabilitycontacts_create_contactno sensitive capabilitycontacts_delete_contactno sensitive capabilitycontacts_listno sensitive capabilitycontacts_list_address_booksno sensitive capabilitycontacts_query_contactsno sensitive capabilitycontacts_update_contactno sensitive capabilityfiles_create_folderno sensitive capabilityfiles_deleteno sensitive capabilityfiles_moveno sensitive capabilityfiles_uploadno sensitive capabilityhealth_checkno sensitive capabilitymail_archive_emailno sensitive capabilitymail_create_mailboxno sensitive capabilitymail_create_masked_emailno sensitive capabilitymail_delete_emailno sensitive capabilitymail_delete_mailboxno sensitive capabilitymail_get_emailno sensitive capabilitymail_get_email_threadno sensitive capabilitymail_get_recent_emailsno sensitive capabilitymail_import_emailno sensitive capabilitymail_list_identitiesno sensitive capabilitymail_list_mailboxesno sensitive capabilitymail_list_masked_emailsno sensitive capabilitymail_manage_email_labelsno sensitive capabilitymail_mark_email_readno sensitive capabilitymail_move_emailno sensitive capabilitymail_pin_emailno sensitive capabilitymail_rename_mailboxno sensitive capabilitymail_reply_to_emailno sensitive capabilitymail_search_emailsno sensitive capabilitymail_search_snippetsno sensitive capabilitymail_set_identityno sensitive capabilitymail_update_masked_emailno sensitive capabilitymail_upload_attachmentno sensitive capability
Toxic flows 1
Cross-tool combinations that form a data-exfiltration primitive (untrusted input → sensitive source → external sink).
What this scan could not see
- Tools were statically extracted from the published source (48 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Versions 1
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v0.3.2 latest |
A 93/100 | 1 | 1.13.0 | 2026-08-25 |
Embed this score
Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.
Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
npx mcptrustchecker scan pyfastmail-mcp --online --registry pypiMore in Cloud & DevOps
Operator control CLI for AdGuard Home with an MCP adapter
interacting with Aliyun (Alibaba Cloud) services through This MCP server provides tools.
MCP server for the Aspro.Cloud REST API
MCP server for Atlassian Confluence and Jira Cloud APIs
AuroraCloud-first MCP server that exposes AuroraDocs workspace data to Claude Desktop and other AI agents
The official AWS Knowledge Base retrieval server using Bedrock Agent Runtime.