Postwing Blog

You do not need to open SMTP ports or run a mail server to receive email in your application. With an inbound email service, messages are accepted for your domain, parsed, and delivered to your application through signed HTTPS webhooks.

Learn how to send millions of emails a month: queueing, rate limits, concurrency, multiple domains, retries, and monitoring for scalable email infrastructure.

Dedicated IP email vs shared IP email: learn when each makes sense, volume thresholds, IP warm-up, reputation, and cost with a clear comparison table.

Master email bounce handling: hard vs soft bounces, bounce codes, suppression lists, retry logic, and webhook processing with practical code examples.

Master transactional email templates with developer-focused best practices: responsive HTML, MJML, dark mode, accessibility, dynamic variables, and testing.

Email webhooks push delivery, bounce, open, and complaint events to your app in real time. Learn endpoint setup, signature verification, and retries with code.

Build a password reset email flow that delivers: secure token generation, SPF/DKIM/DMARC setup, content best practices, and production-ready code examples.

Learn to send transactional email in Python with an email API: working requests/httpx code, env config, retries, error handling, and webhook processing.

Send Node.js transactional email in 10 minutes. Step-by-step guide to an email API with fetch/axios, env config, error handling, retries, and webhooks.

Email monitoring catches delivery failures before users notice. Learn what to track, how to set it up, and why SaaS apps can't run blind on transactional mail.

Learn how SPF, DKIM, and DMARC email authentication works, with real DNS records, setup steps, and fixes for the mistakes that send mail to spam.

A practical email deliverability checklist for SaaS startups: SPF, DKIM, DMARC, domain setup, monitoring, and reputation tips to improve email delivery fast.

Compare the best transactional email service options in 2026. Deliverability, pricing, APIs, and Resend & Postmark alternatives for developers and SaaS.

Password reset emails go to spam more than any other message. Learn the email deliverability fixes that get reset links into the inbox, every time.

Transactional vs marketing email: learn the technical, legal, and deliverability differences so your password resets and receipts always hit the inbox.

SMTP vs API for sending email: compare speed, deliverability, security, and scale. A developer-focused guide to choosing the right method for your app.

Transactional email explained for SaaS founders: how it works, why deliverability matters, key APIs, costs, and best practices to ship reliable emails.