PixelLetter

Send letters, PDFs, postcards, faxes, or query PixelLetter account credit via the PixelLetter HTTPS API with automated physical mail dispatch.

Use this skill when a user wants to send or test a letter/PDF/fax through PixelLetter, query PixelLetter account information, or build workflows around PixelLetter's HTTPS API.

Setup

1. Create a free account at https://www.pixelletter.de
2. Add credit to your account (letters cost approx. €0.79–€1.99 each)
3. Provide credentials via environment variables:

export PIXELLETTER_EMAIL="[e-mail]"
export PIXELLETTER_PASSWORD="yourpassword"

Or use secret injection (e.g. Proton Pass):

PIXELLETTER_EMAIL='pass://Personal/Pixelletter/email' \
PIXELLETTER_PASSWORD='pass://Personal/Pixelletter/password' \
pass-cli run -- node scripts/pixelletter.mjs account

4. Test with a dry-run first — no mail is sent, no costs incurred.

Safety rules

• PixelLetter dispatches real postal mail/faxes and may create costs.
• Default to test mode. Never run a productive send unless the user explicitly confirms the exact recipient, document/text, options, and cost/dispatch intent.
• Never store credentials in the skill or examples. Use environment variables or secret injection:
  • PIXELLETTER_EMAIL
  • PIXELLETTER_PASSWORD
• Do not expose credentials in logs, dry-runs, commits, screenshots, or community-shared examples.
• Prefer PDF upload for already-rendered letters. Use text mode only for simple letters where PixelLetter handles layout.
• Treat API success code 100 as "transmission accepted", not final delivery. PixelLetter sends final confirmation later by email.

CLI wrapper

Bundled script: scripts/pixelletter.mjs

Run from the skill directory or pass the full script path.

PIXELLETTER_EMAIL="..." PIXELLETTER_PASSWORD="..." \
node scripts/pixelletter.mjs account

Dry-run a text letter

node scripts/pixelletter.mjs send-text \
  --address-file /path/address.txt \
  --message-file /path/message.txt \
  --subject "Betreff" \
  --destination DE \
  --dry-run

Test-mode PDF upload (safe, no real dispatch)

PIXELLETTER_EMAIL="..." PIXELLETTER_PASSWORD="..." \
node scripts/pixelletter.mjs send-upload \
  --file /path/letter.pdf \
  --destination DE

Real dispatch

Only after explicit user confirmation:

PIXELLETTER_ALLOW_REAL_SEND=true \
PIXELLETTER_EMAIL="..." PIXELLETTER_PASSWORD="..." \
node scripts/pixelletter.mjs send-upload \
  --file /path/letter.pdf \
  --destination DE \
  --production \
  --confirm-real-send

Important options

• --action 1|2|3
  • 1 = postal letter only (default)
  • 2 = fax only
  • 3 = postal letter and fax
• --fax "+49 ..." is required for action 2 or 3.
• --destination DE is required for postal letter actions 1 or 3.
• --location 1|2|3
  • 1 = München (default)
  • 2 = Hausleiten bei Wien
  • 3 = Hamburg
• --addoption registered-mail options, comma-separated:
  • 27 Einschreiben
  • 28 Rückschein, only with 27
  • 29 Eigenhändig, only with 27
  • 30 Einschreiben Einwurf, not combinable

API reference

For endpoint details and response shape, read references/api.md only when needed.