Founded in 1998 and headquartered in the UK/Luxembourg, Spamhaus is the world's largest anti-spam DNSBL organization. Its ZEN composite blocklist is queried by 3+ billion mail servers daily, making it an essential spam filtering reference for email infrastructure.
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7 results shownCold Email Sending Strategies: Building Email Reputation for New Domains
New domains or IPs face reputation challenges when sending emails. This article covers cold start strategies to quickly build email sending reputation.
Email SPF/DKIM/DMARC Configuration: Improving Email Deliverability and Security
SPF, DKIM, and DMARC are the three core email authentication protocols. This article explains their principles and configuration methods in detail.
Email Deliverability Optimization Guide: SPF/DKIM/DMARC Configuration
Email deliverability affects whether your emails reach the inbox. This article details SPF, DKIM, and DMARC authentication configuration.
Email Service Setup Guide: SendGrid & Mailgun Integration from Start to Expert
Transactional and marketing emails are essential for website operations. Detailed guide on SendGrid and Mailgun setup, SPF/DKIM/DMARC configuration, and troubleshooting.
Email Deliverability Monitoring Tools: Real-Time Insights into Email Performance
Email deliverability directly impacts marketing ROI. This article provides an in-depth review of 8 major tools including GlockApps, Postmark, MXToolbox, and Mail-Tester, covering pre-send testing, real-time monitoring, blacklist detection, and authentication configuration checks.
The New DMARC Standard: RFC 9989/9990/9991 Are Here
In May 2026, the IETF published the new DMARC standard RFC 9989/9990/9991, replacing RFC 7489. Core logic is unchanged, but np/psd tags are added and pct/rf/ri retired — senders should audit SPF/DKIM alignment now.
BIMI Explained: Inbox Logos and Brand Trust
BIMI is the reward for solid email authentication: once SPF/DKIM/DMARC are in place and enforced, Gmail, Apple Mail, and others can display your brand logo in the inbox. This article covers how BIMI works, the DMARC prerequisite, and the setup steps.