Blogs
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DMARC
How to Configure SPF, DKIM, and DMARC for Multiple Domains on One Mail Server
A practical guide to setting up SPF, DKIM, and DMARC authentication for multiple domains on a single mail server. Covers record planning, common mistakes, and multi-domain monitoring.
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DKIM
Why DKIM Breaks After DNS Migration and How to Prevent It
DNS migrations corrupt DKIM TXT records more often than most admins expect. When the DKIM selector record becomes unreadable or is split across multiple records, email starts failing DMARC and legitimate mail goes to spam. Here is why it happens and how to prevent it.
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How to Detect Mailbox Folder Permission Persistence After an Exchange OWA Compromise
OWA compromise remediation stops at password resets. Attackers can leave Default-to-Owner folder permission grants on the server. Learn how to detect and remove them.
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Deliverability
Why Exchange Online Quarantines Legitimate Email (And How to Fix It)
Exchange Online quarantine sometimes blocks legitimate email. Here is why it happens, how to diagnose it, and how to stop it from happening again.
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Deliverability
Why Exchange Online Quarantines Legitimate Email (And How to Fix It)
Exchange Online quarantine sometimes blocks legitimate email. Here is why it happens, how to diagnose it, and how to stop it from happening again.
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Deliverability
Why Exchange Online Quarantines Legitimate Email (And How to Fix It)
Exchange Online quarantine sometimes blocks legitimate email. This guide covers the main causes, how to diagnose them, and how to get mail released and prevent recurrence.
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Deliverability
How to Set Up Email Bomb Alerts in Microsoft Defender
Email bomb attacks flood a user's inbox to hide account takeover activity. This guide shows how to configure Microsoft Defender alerts to catch high-volume mail floods before they drown out real threats.
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DMARC
Why Your Subdomain Email Gets Rejected by DMARC (And How to Fix It)
Your subdomain inherits DMARC policy from your root domain. If the root domain uses p=reject and the subdomain has no SPF or aligned DKIM, legitimate subdomain mail gets silently blocked. Here is how the inheritance mechanism works and how to fix it.
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DMARC
What DMARC Failure Reports Tell You About Your Email Security
DMARC failure reports show which servers cannot authenticate email from your domain. Here is how to read them, which failures are normal, and which ones demand immediate attention.
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DMARC
Why Microsoft Outlook Marks Reported Phishing Emails as Clicked
When employees use the Outlook Report Phishing button, Microsoft Defender automatically visits embedded URLs for analysis. Phishing simulation platforms log this as a user click, creating false positives that wrongly penalize innocent employees.