Blog
Guides, deep dives, and best practices on email deliverability and validation.
How to integrate OhBounce.ai into your sign-up flow in 10 minutes
Stop invalid emails from ever entering your database. We walk through adding real-time validation to your registration form using the REST API — with code examples for React, Next.js, and plain HTML.
Why disposable emails are killing your sender reputation
Temporary email addresses account for up to 12% of new sign-ups. Here's what happens when they reach your ESP, why they trigger spam filters, and how to block them at the source.
SMTP verification explained: what it is and why it matters
Most validators stop at syntax and MX checks. Real-time SMTP probing goes further — knocking on the receiving server's door without sending a message. Here's exactly what happens in that handshake.
Bulk email validation: processing 100k addresses in under a minute
Our async bulk pipeline was built from scratch to handle enterprise-scale validation without blocking your application. Here's the architecture — job queues, worker distribution, and result pagination.
Email list hygiene: the complete checklist for 2026
A dirty list costs you money in bounces, damages your domain reputation, and burns your audience. This checklist covers syntax scrubbing, SMTP verification, catch-all handling, and re-engagement windows.
How one SaaS cut their bounce rate from 8% to 0.3%
A B2B SaaS with 50,000 users had an 8% hard bounce rate and a suspended SendGrid account. We walk through the three-step fix they implemented in a single week.
What is a catch-all email domain — and should you send to one?
Catch-all domains accept every incoming message whether or not the mailbox exists. That makes them impossible to verify with SMTP alone. Here's how to identify them and decide whether to include them in your sends.
How to validate emails in Python using the OhBounce.ai API
A step-by-step guide to integrating email validation into a Python application — covering single-address validation, bulk jobs, and handling the async polling pattern with asyncio.
Spam traps: what they are, how they work, and how to avoid them
Spam traps look like real email addresses but are seeded by blocklist operators to catch senders with poor hygiene. Landing in one can get your IP or domain blacklisted overnight.