Features

Everything required to put paper in the mail — and to let software do it for you.

For people

Upload PDF or compose

Drop a finished document or write a letter in a focused editor.

Email to Letter

Get a unique inbox and turn matching emails into First-Class letters. Choose approval or autosend, set spending limits, and preview or download your letters. Explore Email to Letter.

Email to Postcard

Turn emails into either postcard type with saved rules, artwork, review or authorized autosend. Open Email to Postcard.

Address book

Save senders and recipients. Load them into From or To on the send screen.

Save from send

One click on the send screen stores sender or recipient in the address book.

Tracking

Job statuses from queued through mailed, with USPS tracking when available.

For mail classes

First-Class

#10 letters. First-page price plus additional pages.

Certified Mail

Certified piece with the first page included; additional pages priced separately.

Electronic Return Receipt

Optional ERR add-on on Certified pieces.

Postcards

Send one 5.5 × 4.25 inch single-sided or 8.5 × 5.5 inch double-sided postcard, with full color included. How to send a postcard.

More products

Flats, statements, payment coupon sheets, other postcard sizes and custom print options. Explore the catalog.

For software

REST API

Create letters, list jobs, validate addresses, quote prices.

API keys

lbl_live_ and lbl_test_ keys, hashed storage, revoke anytime. CSV lists via the API.

MCP

Send mail from Claude, Cursor, and other clients with an API key, org credits, or a Square checkout.