Add DeltaChat Channel

The adapter drives the @deltachat/stdio-rpc-server JSON-RPC subprocess directly — pure Node.js against the DeltaChat core library. Messages are delivered over email with Autocrypt/OpenPGP encryption.

Install

Pre-flight (idempotent)

Skip to Credentials if all of these are already in place:

• src/channels/deltachat.ts exists
• src/channels/index.ts contains import './deltachat.js';
• @deltachat/stdio-rpc-server is listed in package.json dependencies

Otherwise continue. Every step below is safe to re-run.

1. Fetch the channels branch

git fetch origin channels

2. Copy the adapter

git show origin/channels:src/channels/deltachat.ts > src/channels/deltachat.ts

3. Append the self-registration import

Append to src/channels/index.ts (skip if already present):

import './deltachat.js';

4. Install the adapter package (pinned)

pnpm install @deltachat/stdio-rpc-server@2.49.0

5. Build

pnpm run build

Account Setup

A dedicated email account is strongly recommended — it will accumulate DeltaChat-formatted messages and store encryption keys. Not all providers work well with DeltaChat; check https://providers.delta.chat/ before picking one.

Default security modes: IMAP uses SSL/TLS (port 993), SMTP uses STARTTLS (port 587). Both are configurable via .env — see Credentials below.

To find the correct hostnames for a domain:

node -e "require('dns').resolveMx('example.com', (e,r) => console.log(r))"

Most providers publish their IMAP/SMTP hostnames in their help docs under "manual setup" or "IMAP access."

Credentials

Add to .env:

DC_EMAIL=bot@example.com
DC_PASSWORD=your-app-password
DC_IMAP_HOST=imap.example.com
DC_IMAP_PORT=993
DC_IMAP_SECURITY=1        # 1=SSL/TLS (default), 2=STARTTLS, 3=plain
DC_SMTP_HOST=smtp.example.com
DC_SMTP_PORT=587
DC_SMTP_SECURITY=2        # 2=STARTTLS (default), 1=SSL/TLS, 3=plain

Security settings are applied on every startup, so changing them in .env and restarting takes effect without wiping the account.

Sync to container: mkdir -p data/env && cp .env data/env/env

Optional settings

The following are read from the process environment (not .env). To override them, add Environment= lines to the systemd service unit or your launchd plist:

The /set-avatar command (send an image with that caption) is the easiest way to set the avatar at runtime without modifying the service file. Only users with owner or global admin role can use it.

Restart

Run from your NanoClaw project root:

source setup/lib/install-slug.sh

# Linux
systemctl --user restart $(systemd_unit)

# macOS
launchctl kickstart -k gui/$(id -u)/$(launchd_label)

On first start the adapter configures the email account (IMAP/SMTP credentials, calls configure()). Subsequent starts skip straight to startIo(). Account data is stored in dc-account/ in the project root (or your DC_ACCOUNT_DIR).

Wiring

DMs

DeltaChat contacts cannot be added by email alone — to start a chat, the user must open the bot's invite link in their DeltaChat app or scan its QR code. This triggers the SecureJoin handshake.

Step 1 — Get the invite link

After the service starts, the adapter logs the invite URL and writes a QR SVG:

grep "invite link" logs/nanoclaw.log | tail -1
# url field contains the https://i.delta.chat/... invite link
# also written to dc-account/invite-qr.svg (or $DC_ACCOUNT_DIR/invite-qr.svg)

The invite URL is stable (tied to the bot's email and encryption keys) so it stays valid across restarts.

Step 2 — Add the bot in DeltaChat

Two options for the user to connect:

• Link: Copy the https://i.delta.chat/... URL and open it on the device running DeltaChat. The app recognises it and shows a "Start chat" prompt.
• QR code: Open dc-account/invite-qr.svg in a browser or image viewer, display it on screen, and scan it from the DeltaChat app using the QR-scan button on the new-chat screen.

After accepting, DeltaChat exchanges keys and creates the chat automatically.

Step 3 — Wire the chat to an agent

Once the first message arrives the router auto-creates a messaging_groups row. Look up the chat ID:

pnpm exec tsx scripts/q.ts data/v2.db \
  "SELECT platform_id, name FROM messaging_groups WHERE channel_type='deltachat' AND is_group=0 ORDER BY created_at DESC LIMIT 5"

Then run /init-first-agent — it creates the agent group, grants the user owner access, and wires the messaging group in one step:

pnpm exec tsx scripts/init-first-agent.ts \
  --channel deltachat \
  --user-id deltachat:user@example.com \
  --platform-id <platform_id from above> \
  --display-name "Your Name"

Groups

Add the bot email to a DeltaChat group. When any member sends a message, the router creates a messaging_groups row with is_group = 1. Run /manage-channels to wire it to an agent group.

Next Steps

If you're in the middle of /setup, return to the setup flow now.

Otherwise, run /init-first-agent to create an agent and wire it to your DeltaChat DM (see Wiring above), or /manage-channels to wire this channel to an existing agent group.

Channel Info

• type: deltachat
• terminology: DeltaChat calls them "chats" (1:1 DMs) and "groups"
• supports-threads: no — DeltaChat has no thread model
• platform-id-format: numeric chat ID as a string (e.g. "12") — the DeltaChat core's internal chat identifier
• user-id-format: deltachat:{email} — the contact's email address
• how-to-find-id: Send a message from DeltaChat to the bot email, then query messaging_groups as shown above
• typical-use: Personal assistant over DeltaChat DMs; small groups where participants use DeltaChat
• default-isolation: One agent per bot identity. Multiple chats with the same operator can share an agent group; groups with other people should typically use isolated session mode

Features

• File attachments — inbound and outbound; inbound waits up to 30 seconds for large-message download to complete
• Invite link logged on every startup — URL + QR SVG written to dc-account/invite-qr.svg; see Wiring for the bootstrap flow
• /set-avatar — send an image with this caption to change the bot's DeltaChat avatar (admin/owner only)
• Connectivity watchdog — restarts IO if IMAP goes quiet for 20 minutes or connectivity drops below threshold for two consecutive 5-minute checks
• Network nudge — maybeNetwork() called every 10 minutes to recover from prolonged idle

Not supported: DeltaChat reactions, message editing/deletion, read receipts.

Connectivity model

isConnected() returns true when the internal connectivity value is ≥ 3000:

Troubleshooting

Adapter not starting — credentials missing

grep "Channel credentials missing" logs/nanoclaw.log | grep deltachat

All six required vars (DC_EMAIL, DC_PASSWORD, DC_IMAP_HOST, DC_IMAP_PORT, DC_SMTP_HOST, DC_SMTP_PORT) must be present in .env.

Account configure fails

grep "DeltaChat" logs/nanoclaw.log | tail -20

Common causes:

• Wrong IMAP/SMTP hostnames — double-check provider docs
• App password not generated — Gmail and some others require this when 2FA is enabled
• Port/security mismatch — defaults are port 993 + SSL/TLS for IMAP and port 587 + STARTTLS for SMTP;