Lob MCP. Automate every piece of physical mail, from checks to postcards.

This server lets your agent handle physical mail—letters, postcards, and checks—right out of your application. It's designed for anything that needs to hit the mailbox or bank account, whether it’s direct marketing, vendor payments, or payroll runs. You don’t have to leave your workflow to get things printed, processed, and sent through USPS.

Handling Addresses and Recipients
When you need an address, you first run verify_us_address to check any given US location; this standardizes the format and confirms whether it's actually deliverable by the post office. If you only have a partial address, use autocomplete_us_address, and your agent will fill in the rest. For managing contacts, you can add new recipients to your internal book with create_address.

You'll find all stored addresses listed using list_addresses, or you can pull specific details for a known ID via get_address. If an address gets deleted, run delete_address to clear the record.

Building Templates and Content
Before sending anything personal, you build reusable templates. You create these structures using create_template, saving them as HTML documents that support merge variables so you can personalize mass mailings. To view what templates are available for use, run list_templates. If you need details on a saved template, call get_template.

Generating Physical Mail (Letters and Postcards)
To send personalized letters, your AI client uses create_letter, combining the required HTML template, a verified recipient address, and sender details. For postcards, use create_postcard to generate and mail physical items with customizable front and back designs. If you change your mind about a letter that's stuck in processing, you can stop it entirely by running cancel_letter.

Processing Financial Payments (Checks)
For payments, the agent handles everything from setup to mailing. You start by registering necessary bank account details using create_bank_account, and you can see all configured accounts by calling list_bank_accounts. Once the account is set up, you generate a physical check for payment with create_check; this tool requires an existing bank account ID and handles the amount and recipient.

You'll need to track those payouts; run list_checks to get a list of every check sent through, helping you audit payments or find a specific disbursement status using get_check.

Tracking Everything You Send
The server lets you track all physical mail. To see the history and current status of any letter you've mailed out, call get_letter, and to view a full list of all letters sent, run list_letters; this gives you tracking numbers and expected delivery dates. Similarly, you can check postcard details using get_postcard or get a comprehensive mailing history by running list_postcards.

You also maintain records of the mail templates you build with list_templates, giving you an overview of all available content structures.