Hornetsecurity 365 Total Protection is the cloud SEG for SMBs and MSPs (ex-Vade, now Proofpoint). Complete guide: architecture, mx01.hornetsecurity.com MX, spf.hornetsecurity.com SPF include, DKIM by CNAME, gateway vs API and a comparison with Proofpoint/Barracuda/Mimecast.
Barracuda Email Gateway Defense is the cloud SEG for SMBs and MSPs (200,000+ customers). Complete guide: architecture, *.ess.barracudanetworks.com MX, SPF/DKIM/DMARC, DNS detection, the distinction with the ESG appliance (CVE-2023-2868) and a comparison with Mimecast/Proofpoint/Defender.
Everything about the CAA DNS record: syntax, issue/issuewild/iodef tags, critical flag, inheritance, RFC 8659 and 8657, multi-provider setup, and auditing.
The IETF is reclassifying ARC (RFC 8617) as "Historic." But deprecated on paper does not mean dead in practice: Apple, Google and Microsoft still require it. Here is what really changes and what you should do.
The email deliverability score is not a black box. It rests on five measurable pillars: authentication, reputation, transport security, BIMI and engagement. This guide breaks them down and gives the thresholds to aim for.
In 2026, the status page is no longer a marketing tool. It is an admissible audit artifact for DORA, NIS2 and GDPR. A complete operational guide.
GPTBot, ClaudeBot and PerplexityBot do not follow redirects like Googlebot. Understand their actual behavior to stay visible in ChatGPT, Claude and Perplexity.
