The InboxCheck Blog

Email Deliverability Guides

Plain-English explanations of why emails go to spam — and exactly how to fix it. No jargon, no fluff.

Why Are My Emails Going to Spam? 10 Causes & Fixes (2026)

SPF, DKIM, DMARC, blacklists, low engagement, dirty lists — here are the real reasons your emails aren't reaching the inbox, and what to do about each one.

What Is DMARC and Do You Actually Need It?

A plain-English breakdown of DMARC — what it does, why Gmail and Yahoo now require it, and how to set it up in under 10 minutes.

How to Set Up DKIM for Mailchimp, Klaviyo, SendGrid & More

Step-by-step DKIM setup for the most popular email platforms. Includes screenshots and the exact DNS record to add for each provider.

How to Get Your Domain Removed from a Spam Blacklist

Found your domain on Spamhaus, Barracuda, or SpamCop? Here's how to request removal, how long it takes, and how to avoid getting relisted.

Gmail Bulk Sender Requirements 2026: Full Compliance Checklist

Gmail now rejects email from senders who don't meet authentication requirements. Here's the complete checklist to make sure you're compliant.