The Risu Mail Blog
Engineering notes, deliverability guides, and product updates from the team building the future of email.
Free Email API for Developers — Top 5 Options Compared
A neutral comparison of top free email API tools with focus on pricing, deliverability, and developer ergonomics.
How to Set Up SMTP in Your Next.js App (Free)
A framework-friendly SMTP setup guide for Next.js apps, including authentication and retry handling.
SendGrid vs Risu Mail — Full 2025 Comparison
Feature-by-feature review of onboarding, API usability, free tier limits, and migration effort.
How to Send OTP Emails Free with Risu Mail API
Build secure OTP email workflows with expiration, anti-abuse rules, and delivery tracking.
Best Free Email Services for Students in 2025
A student-focused breakdown of free email tools for hackathons, portfolios, and campus products.
Transactional Email vs Marketing Email — What's the Difference?
Understand when to use transactional versus campaign email and how it impacts architecture.
How to Avoid Email Going to Spam — Developer Guide
A deliverability checklist covering SPF, DKIM, DMARC, list hygiene, and sender reputation.
Python Email Sending Guide — SMTP + API (Free)
Use Python to send reliable email with SMTP and REST examples, retries, and debugging patterns.
What is DKIM, SPF, and DMARC — Email Authentication Guide
A practical guide to DNS authentication records that improve inbox placement and sender trust.
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