Email Authentication
SPF, DKIM, DMARC, and mailbox deliverability basics.
Why Your Email Lands in Spam: SPF, DKIM and DMARC in Practice
Most deliverability problems start in DNS, not in your mail client. A practical walk through MX, SPF, DKIM and DMARC with the mistakes that actually matter.
Reverse DNS (PTR) Records: Who Actually Needs Them
PTR records live in someone else’s zone, which is why they confuse people. Here is how reverse DNS works and when it genuinely matters.
MX, SPF, DKIM, and DMARC: Email Auth in One Sitting
Connect mail routing records with the SPF, DKIM and DMARC policies inbox providers expect, and see which misconfiguration breaks first.