Lob Alternative for AI Agents

TL;DR

If you want to upload a CSV of 50,000 recipients and blast a campaign, use Lob. If you want an AI agent to look at a single conversation and decide to drop a thank-you note in the mail, Mailsnail is the right shape.

What's different

• Interface. Lob is a REST API designed for batch direct mail. Mailsnail is an MCP server designed for agents calling tools one piece at a time. Both are technically possible to use either way; the ergonomics are night-and-day.
• Discovery. Mailsnail publishes an llms.txt, llms-full.txt, and a /setup endpoint so any agent that lands on the docs can self-onboard. Lob's docs are written for humans.
• Mental model. With Lob, your code triggers a campaign. With Mailsnail, your agent decides — autonomously, per-event — to send a piece.

When to pick which

Lob: bulk direct-mail campaigns, marketing automation, scheduled mailings, statement printing.

Mailsnail: agent loops, customer-success automations that occasionally output physical mail, personal AI assistants, anything that decides one-piece-at-a-time.

Migrating from Lob

If you have an existing Lob integration and want to give the same capability to an agent, you don't have to rip Lob out. Wire Mailsnail in as a new MCP server alongside it; the agent picks Mailsnail for one-off pieces and your existing Lob path keeps handling batch campaigns. They coexist.

{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "mailsnail"
      ],
      "env": {
        "MAIL_PROVIDER": "managed",
        "MAIL_API_BASE_URL": "https://api.mailsnail.dev"
      }
    }
  }
}