> ## Documentation Index
> Fetch the complete documentation index at: https://docs.langmail.me/llms.txt
> Use this file to discover all available pages before exploring further.

# Open protocols

> The open-protocol surface of a Langmail mailbox — JMAP, CalDAV, IMAP, and SMTP endpoints on mail.langmail.me, and how each authenticates.

Everything in a Langmail mailbox is reachable over standard protocols on `mail.langmail.me`. This page is the endpoint map — the same one an export tool or a competitor's migration script would use. That's the point.

## Endpoints

| Protocol        | Endpoint                                                                                       | Use                                                          |
| --------------- | ---------------------------------------------------------------------------------------------- | ------------------------------------------------------------ |
| JMAP            | `https://mail.langmail.me` — session at `/.well-known/jmap`                                    | Modern JSON mail access; what the MCP server and webmail use |
| CalDAV          | `https://mail.langmail.me` — discovery at `/.well-known/caldav`, collections under `/dav/cal/` | Calendars and scheduling; what the calendar tools use        |
| IMAP            | `mail.langmail.me:993` (SSL/TLS) or `:143` (STARTTLS)                                          | Any classic mail client; full archive access                 |
| SMTP submission | `mail.langmail.me:465` (SSL/TLS) or `:587` (STARTTLS)                                          | Sending from mail clients                                    |
| ManageSieve     | `mail.langmail.me:4190`                                                                        | Server-side filtering rules (Sieve)                          |

## Authentication

| Method             | Works for                                          | How to get it                                                                                                                                                                        |
| ------------------ | -------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| OAuth bearer token | JMAP, CalDAV (HTTP `Authorization: Bearer` header) | The [OAuth flow](/connect/authorization) — this is what MCP clients and webmail use                                                                                                  |
| App password       | IMAP, SMTP, CalDAV                                 | Generate in [webmail](https://webmail.langmail.me) under **Settings → Security**; see [Use a mail client](/guides/mail-clients) or [Use a calendar client](/guides/calendar-clients) |

Your account password is never used directly by mail protocols — interactive sign-in is Google-based, and each device or script gets its own revocable app password.

## What this buys you

* **Complete export, any time.** An IMAP or JMAP sync of your mailbox is a complete, portable archive in standard formats — including the category keywords Langmail adds, which are plain mailbox keywords.
* **Client freedom.** Apple Mail, Thunderbird, Outlook, mutt, offlineimap — any standards-compliant mail client works without Langmail's involvement.
* **No proprietary surface to depend on.** The MCP server itself is a thin layer over JMAP and CalDAV. If you outgrow it, the protocols underneath are yours.

<Note>
  Metadata that lives outside the mailbox — account settings, Morning Brief configuration — is app-level and not part of the protocol surface.
</Note>