SPF, DKIM, DMARC (Bonus: BIMI) — Setup from Scratch, Common Mistakes, and the Right Way

SPF/DKIM/DMARC setup, common mistakes and the 2026 standard DMARCbis (RFC 9989) — the AI era and bonus BIMI.

Null MX (RFC 7505): A Domain That Accepts No Mail

Sealing non-mail domains with RFC 7505 null MX: the MX 0 . record and its synergy with SPF -all and DMARC np.

Phishing Simulation and Security Awareness Training (SAT): "Click Rate" Is Not a Target

When click rate becomes a target it rewards pattern learning and hides real resilience. The right metrics (report rate and speed), five principles of a good program, and combining SAT with the technical layer.

Email Security in Textile & Apparel: Global Brand Orders, Season Pressure, and the Sample-to-Production Chain

In textile, a global brand's name suppresses the questioning reflex; "if they wanted it this way it must be right" opens the door to a fake payment instruction. Season pressure, receivable risk, and design leakage.

Borsa Istanbul Email Security Report Card: DMARC and DNSSEC Across 625 Companies (October 2026)

Half of 625 listed companies lack DMARC protection; DNSSEC is on for only 5 domains.

Email Authentication Report Card: DMARC Across 21,197 Domains (September 2026)

Mailskop September 2026: SPF/DKIM/DMARC report card of 21,197 domains. 7 in 10 are unprotected against fake email.