Mail

The mail module provides a consistent API for sending email regardless of which delivery service you use. Switch between SMTP, Resend, Postmark, or the console driver without changing any of your application code.

Import

import { createMail } from '@loewen-digital/fullstack/mail'

Basic usage

import { createMail } from '@loewen-digital/fullstack/mail'

const mail = createMail({
  driver: 'smtp',
  from: { name: 'My App', address: 'hello@example.com' },
  smtp: {
    host: process.env.SMTP_HOST!,
    port: 587,
    auth: { user: process.env.SMTP_USER!, pass: process.env.SMTP_PASS! },
  },
})

await mail.send({
  to: 'alice@example.com',
  subject: 'Welcome to My App',
  text: 'Thanks for signing up!',
  html: '<p>Thanks for signing up!</p>',
})

Sending to multiple recipients

await mail.send({
  to: ['alice@example.com', 'bob@example.com'],
  cc: 'manager@example.com',
  bcc: 'archive@example.com',
  subject: 'Team update',
  text: 'Here is the weekly update...',
})

Attachments

await mail.send({
  to: 'alice@example.com',
  subject: 'Your invoice',
  text: 'Please find your invoice attached.',
  attachments: [
    {
      filename: 'invoice-2026-04.pdf',
      content: pdfBytes, // Uint8Array
      contentType: 'application/pdf',
    },
  ],
})

Development: console driver

Use the console driver in development to see emails in your terminal without sending them:

const mail = createMail({
  driver: process.env.NODE_ENV === 'production' ? 'resend' : 'console',
  from: { name: 'My App', address: 'hello@example.com' },
  resend: { apiKey: process.env.RESEND_API_KEY! },
})

Driver options

Driver	Description
console	Prints emails to stdout. No external service needed.
smtp	Standard SMTP. Works with any SMTP server.
resend	Resend API. Requires resend npm package.
postmark	Postmark API. Requires postmark npm package.

Config options

Option	Type	Default	Description
driver	'console' | 'smtp' | 'resend' | 'postmark'	—	Mail driver
from.name	string	—	Default sender name
from.address	string	—	Default sender email address
smtp.host	string	—	SMTP server hostname
smtp.port	number	587	SMTP server port
smtp.auth.user	string	—	SMTP username
smtp.auth.pass	string	—	SMTP password
resend.apiKey	string	—	Resend API key
postmark.serverToken	string	—	Postmark server token