email-imap-fetch（电子邮件 imap 获取）

Email IMAP Fetch

Core Goal

• Wait for new mail with IMAP IDLE.
• Fetch unread messages after each wake-up.
• Support multiple mailbox accounts configured with env.
• Control IDLE support strictly with env mode (idle or poll) without runtime probing.
• Forward each fetched email to OpenClaw webhooks.
• Emit machine-readable JSON lines for downstream steps.
• Keep this skill strictly in stage-1 routing mode: send snippet + structured refs only, never send full raw message body, and never send attachment binary/content.

Workflow

1. Configure account env variables and OpenClaw webhook env variables (see references/env.md and assets/config.example.env).
2. Validate configuration:

python3 scripts/imap_idle_fetch.py check-config

1. Run one IDLE cycle per account (smoke test):

python3 scripts/imap_idle_fetch.py listen --cycles 1 --idle-seconds 120 --max-messages 10

1. Run continuously (default resident mode):

python3 scripts/imap_idle_fetch.py listen

Runtime Model

• Skill files are installed locally, but the listener is not auto-started.
• In idle mode, IMAP IDLE receives push events only while listener process and IMAP connection are alive.
• In poll mode, listener sleeps for poll interval and then fetches unread messages.
• If the process exits, push events are missed; next run can still fetch existing unread emails with UNSEEN.
• Default runtime is resident mode (IMAP_CYCLES=0 by default).
• Default IDLE mode is poll (safe for servers without IDLE support).
• In production, always-on deployment must run under systemd, launchd, supervisor, or an equivalent daemon manager.
• Do not run the listener as a foreground process bound to an interactive exec session; once that session exits, the listener will stop.

Output Contract

• Output format is JSONL (one JSON object per line).
• type=status for lifecycle events.
• type=message for fetched emails with:

- account, mailbox, seq, uid - subject, from, to, date - message_id_raw, message_id_norm (and compatibility field message_id) - snippet (plain-text preview only) - attachment_count, attachment_manifest (summary only, no attachment content) - mail_ref machine-readable object (account, mailbox, uid, message_id_raw, message_id_norm, date)

• Webhook message includes two fixed machine-readable blocks for deterministic dispatch extraction:

- <<<MAIL_REF_JSON>>>... <<<END_MAIL_REF_JSON>>> - <<<ATTACHMENT_MANIFEST_JSON>>>... <<<END_ATTACHMENT_MANIFEST_JSON>>>

• wait_mode is idle or poll in cycle status output.
• wait_events records the active wait strategy details.
• event=webhook_delivered status events when OpenClaw webhook POST succeeds.
• type=error for account-level failures.
• event=webhook_failed error events when OpenClaw webhook POST fails.

Parameters

• --cycles: IDLE cycles per account (0 means forever).
• --idle-seconds: max wait time for each IDLE call.
• --poll-seconds: interval used when polling mode is active.
• --idle-mode: idle or poll.
• --max-messages: max unread emails fetched each cycle.
• --mark-seen / --no-mark-seen: control unread state updates.
• --snippet-chars: preview length limit.
• --connect-timeout: connection timeout seconds.
• --retry-seconds: retry delay after failure.

Environment defaults:

• IMAP_CYCLES
• IMAP_IDLE_MODE
• IMAP_IDLE_SECONDS
• IMAP_POLL_SECONDS
• IMAP_MAX_MESSAGES
• IMAP_MARK_SEEN
• IMAP_SNIPPET_CHARS
• IMAP_CONNECT_TIMEOUT
• IMAP_RETRY_SECONDS

OpenClaw webhooks forwarding:

• OPENCLAW_WEBHOOKS_ENABLED
• OPENCLAW_WEBHOOKS_TOKEN
• OPENCLAW_WEBHOOKS_BASE_URL
• OPENCLAW_WEBHOOKS_MODE (agent or wake)
• OPENCLAW_WEBHOOKS_ENDPOINT (optional endpoint override)
• OPENCLAW_WEBHOOKS_PATH
• OPENCLAW_WEBHOOKS_WAKE_MODE
• OPENCLAW_WEBHOOKS_DELIVER
• OPENCLAW_WEBHOOKS_TIMEOUT
• OPENCLAW_WEBHOOKS_NAME
• OPENCLAW_WEBHOOKS_AGENT_ID
• OPENCLAW_WEBHOOKS_CHANNEL
• OPENCLAW_WEBHOOKS_TO
• OPENCLAW_WEBHOOKS_MODEL
• OPENCLAW_WEBHOOKS_THINKING
• OPENCLAW_WEBHOOKS_AGENT_TIMEOUT_SECONDS
• OPENCLAW_WEBHOOKS_SESSION_KEY_PREFIX

Error Handling

• Invalid env configuration exits with code 2.
• In idle mode, unsupported IDLE returns explicit error and suggests IMAP_IDLE_MODE=poll.
• Runtime failures are emitted as type=error.
• Command exits non-zero when account processing errors occur.

References

• references/env.md

Assets

• assets/config.example.env

Scripts

• scripts/imap_idle_fetch.py