PostFlex gives you the APIs, SMTP relay, and analytics to send transactional emails reliably at any scale. Ship in minutes, not weeks.
From simple transactional emails to complex workflows, PostFlex provides the infrastructure to ensure every message lands in the inbox.
RESTful API with sub-100ms response times. Send single emails or batch thousands with one request. SDKs for every major language.
SOC 2 Type II compliant. DKIM, SPF, and DMARC authentication built-in. TLS encryption for every message in transit.
Track opens, clicks, bounces, and deliveries in real-time. Webhooks for every email event with detailed metadata.
Intelligent routing optimizes delivery paths. Automatic failover between IPs ensures maximum deliverability at all times.
Dynamic templates with Handlebars syntax. Version control, A/B testing, and responsive design built into every template.
Real-time event notifications for delivery, opens, clicks, bounces, and spam complaints. Retry logic built-in.
Clean, intuitive API that gets out of your way. No complex configuration required.
import { PostFlex } from 'postflex'; const client = new PostFlex('your-api-key'); await client.send({ from: 'hello@yourapp.com', to: 'user@example.com', subject: 'Welcome to our platform!', template: 'welcome', data: { name: 'Alex' } }); // Response: { id: "msg_abc123", status: "queued" }
Start free, scale as you grow. No hidden fees, no surprise charges.
Comprehensive guides, API references, and examples to integrate PostFlex quickly.
Set up your account, verify your domain, and send your first email in under 5 minutes.
Read guide →Complete REST API documentation with request/response examples for every endpoint.
Explore API →Official SDKs for Node.js, Python, Ruby, Go, PHP, and Java. Plus community libraries.
View SDKs →Use PostFlex as an SMTP relay. Drop-in replacement for your existing email setup.
Configure SMTP →Build dynamic email templates with variables, conditionals, and loops using Handlebars.
Learn templates →Configure webhook endpoints to receive real-time notifications for all email events.
Set up webhooks →Can't find what you're looking for? Reach out to our support team anytime.
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