Practical guides on SPF, DKIM, DMARC, and getting your emails to the inbox. Written for real senders, not engineers.
The complete guide to every reason your emails land in spam — SPF failures, DKIM missing, blacklists, content triggers — with step-by-step fixes for each.
Complete DKIM setup guide for Google Workspace, Microsoft 365, Zoho, Mailgun, SendGrid, and more.
Step-by-step removal instructions for Spamhaus, Barracuda, SpamCop, and 8 other major blacklists.
DMARC explained in plain English — what it does, why Gmail requires it, and how to set it up in 15 minutes.
How to create, test, and troubleshoot SPF records for your domain. Includes examples for all major providers.
Everything you need to check before sending cold emails — domain warmup, authentication, content, and more.
The complete list of words and phrases that trigger spam filters in Gmail, Outlook, and corporate filters.
Send a test email and get a full delivery audit — authentication, reputation, content, blacklists.
Run Free Test →