Iovo

PHP, MySQL. Deeper expertise is protocol-level: SMTP, MIME, DKIM/SPF/DMARC/ARC, TLS/MTA-STS/DANE — 25+ years hands-on with email infrastructure.

Tracking the 2026 DMARC RFC split (9989/9990/9991) and how mailbox providers are adjusting enforcement in response.

The companion site for Email Decoded — chapter guides, an RFC tracker, and free header-analysis tool directory.

Questions about email authentication, header forensics, or anything SPF/DKIM/DMARC/ARC related. Always happy to look at a confusing bounce message.