DKIM

SPF, DKIM and DMARC: Practical Guide to Detecting Email Spoofing and Phishing

The article explains how email authentication mechanisms SPF, DKIM, and DMARC work together to combat spoofed messages that impersonate trusted services. It provides concrete DNS record examples and shows how to interpret Authentication-Results headers in received emails. SPF verifies authorized sending IP addresses but does not check the visible From address. DKIM adds cryptographic signatures to message content and headers, while DMARC ties these checks to the sender domain visible to users and defines handling policies. The guide also covers common configuration errors, forwarding issues, and why successful authentication does not guarantee message safety. It concludes that these protocols must be combined with additional security measures such as attachment scanning and user awareness training.

BI.ZONE Mail Security 3.0 Enhances Detection of Password-Protected Archives and Spam Variants

BI.ZONE has released Mail Security 3.0, introducing new mechanisms to detect email threats and improved tools for administrators. The updated system now assigns additional risk scores to password-protected archives when their contents cannot be unpacked, without automatically classifying the archive itself as malicious. It also compares message texts to identify near-identical emails used in spam campaigns where attackers slightly alter wording to evade filters. Administrators can now incorporate SPF and DKIM verification results into delivery rules to better distinguish legitimate senders from impersonators. According to BI.ZONE statistics, phishing accounted for 90 percent of illegitimate email traffic in the first half of 2026. Additional protections include CAPTCHA challenges after repeated failed login attempts on administrative accounts. The release also adds bulk management of rules, improved logging with a side panel for message details, a new Events section, and Syslog export to external SIEM systems.