mailstrel

Thin TypeScript client for the Mailstrel cold-outreach API. Mint an API key from Settings > API keys in your dashboard, then call the API from your own product or scripts.

npm install mailstrel

import { Mailstrel } from 'mailstrel'

const ms = new Mailstrel({ apiKey: process.env.MAILSTREL_API_KEY! })

const clients = await ms.clients.list()
const run = await ms.leads.discover(clients[0].id, { niche: 'fintech ops leads' })
const campaign = await ms.campaigns.create({ client_id: clients[0].id, name: 'Q3 outbound' })
await ms.campaigns.launch(campaign.id)

Every named method (clients, leads, campaigns, inbox) is a thin wrapper — the full API surface is reachable directly:

await ms.get('/deliverability')
await ms.post('/senders/lookalike', { domain: 'example.co' })

Errors throw MailstrelError with the server's error message and the HTTP status.

Full endpoint reference: mailstrel.com/docs.