Send transactional emails with Postmark. Use when a user asks to send reliable transactional emails, improve email deliverability, use email templates with variables, or set up email sending for a SaaS app.
Postmark is an email delivery service focused on transactional emails (password resets, receipts, notifications). It has the highest deliverability rates in the industry (99%+ inbox placement), dedicated IP pools for transactional vs marketing, and built-in email templates.
// lib/postmark.ts — Postmark client
import { ServerClient } from 'postmark'
const client = new ServerClient(process.env.POSTMARK_API_TOKEN!)
// Send with HTML
await client.sendEmail({
From: '[email protected]',
To: '[email protected]',
Subject: 'Your order has shipped',
HtmlBody: '<h1>Order Shipped!</h1><p>Tracking: ABC123</p>',
TextBody: 'Order Shipped! Tracking: ABC123',
MessageStream: 'outbound', // 'outbound' for transactional, 'broadcast' for marketing
})
// Send with template
await client.sendEmailWithTemplate({
From: '[email protected]',
To: '[email protected]',
TemplateAlias: 'order-shipped',
TemplateModel: {
customer_name: 'Alice',
order_id: 'ORD-2025-001',
tracking_number: 'ABC123',
tracking_url: 'https://track.example.com/ABC123',
items: [
{ name: 'Widget Pro', quantity: 2, price: '$29.99' },
{ name: 'Gadget Plus', quantity: 1, price: '$49.99' },
],
},
MessageStream: 'outbound',
})
// Send up to 500 emails in one API call
await client.sendEmailBatch([
{
From: '[email protected]',
To: '[email protected]',
Subject: 'Invoice #INV-001',
HtmlBody: renderInvoice(invoice1),
Tag: 'invoice',
},
{
From: '[email protected]',
To: '[email protected]',
Subject: 'Invoice #INV-002',
HtmlBody: renderInvoice(invoice2),
Tag: 'invoice',
},
])
// Postmark can forward inbound emails to your webhook
// POST /webhooks/inbound-email
export async function handleInboundEmail(req) {
const { From, Subject, TextBody, Attachments } = req.body
// Process support emails
await createSupportTicket({
from: From,
subject: Subject,
body: TextBody,
attachments: Attachments.map(a => ({
name: a.Name,
content: Buffer.from(a.Content, 'base64'),
})),
})
}