Email Security Blog
Practical guides on SPF, DKIM, DMARC, deliverability, blacklists, and protecting your domain from spoofing and phishing.
DMARC Policy: None vs Quarantine vs Reject — When to Use Each
Understand the three DMARC policy levels — p=none, p=quarantine, and p=reject — and how to move through them safely without breaking your email delivery.
Email Authentication Setup for Microsoft 365: SPF, DKIM, and DMARC
Complete guide to setting up SPF, DKIM, and DMARC for Microsoft 365. Includes exact DNS records, Admin Center steps, and how to verify everything is working.
Email Deliverability Checklist: 15 Things to Check Before Every Send
A practical 15-point email deliverability checklist covering authentication, content, list hygiene, and sender reputation — everything to check before you hit send.
Google Workspace Email Migration Checklist: Verify SPF, DKIM, and DMARC Before You Go Live
Moving to Google Workspace? Use this checklist to verify SPF, DKIM, and DMARC are correctly configured before cutover — so you don't lose a single email during migration.
How to Add Mailchimp, HubSpot, or Salesforce to Your SPF Record Without Breaking It
Every time you add a new email tool, your SPF record needs updating. Here's how to add third-party senders correctly — and what to do if you're hitting the 10-lookup limit.
How to Check if Your Domain Is on an Email Blacklist (And What to Do)
If your emails are bouncing or going to spam, your domain or IP may be blacklisted. Here's how to check across 12 blacklist zones and what to do if you're listed.
How to Set Up DMARC for Google Workspace (Step-by-Step)
Step-by-step guide to setting up DMARC for Google Workspace. Includes exact DNS record format, how to start safely with p=none, and how to progress to full enforcement.
MXToolbox Alternatives: 5 Free Email Security Checkers Compared
Looking for an MXToolbox alternative? Here are 5 free email security tools compared — including which ones require signup, what they check, and whether they offer help fixing what they find.
SPF, DKIM, and DMARC: What They Are and Why Every Business Needs All Three
SPF, DKIM, and DMARC are the three email authentication standards that protect your domain from spoofing and phishing. Here's what each one does and how to check if yours are set up.
The Real Cost of Email Spoofing: What Happens When Your Domain Is Impersonated
Email spoofing costs SMBs an average of $137,000 per incident. Here's a breakdown of the direct, indirect, and operational costs — and what stops it.
What Is Business Email Compromise (BEC)? How SMBs Get Targeted and How to Stop It
Business Email Compromise costs SMBs an average of $137,000 per incident. Here's how BEC attacks work, why small businesses are targeted, and what stops them.
Why Are My Emails Going to Spam? (And How to Fix It)
Emails landing in spam? Here are the most common causes — missing authentication, blacklists, spam content — and a step-by-step process to diagnose and fix each one.