Set up and troubleshoot the standards that prove your mail is really yours — SPF, DKIM, DMARC, BIMI, MTA-STS, ARC, TLS-RPT, reverse DNS and MX records. Beginner and advanced guides, troubleshooting walkthroughs, and best practices that meet the latest Google, Yahoo and Microsoft sender requirements.
A DMARC record is the DNS entry that ties SPF and DKIM to the address your recipients actually see, tells receiving servers what to do with mail that fails, and asks them to send you reports. It is the keystone of email authentication: SPF and DKIM each prove a domain, but only a DMARC record … Read more
A DKIM record publishes the public key that lets receiving mail servers verify your email was genuinely sent by your domain and was not altered on the way. Where SPF checks the sending server’s IP, DKIM adds a cryptographic signature to every message — which is why a valid DKIM record survives forwarding when SPF … Read more
An SPF record is the DNS entry that tells the world’s mail servers which systems are allowed to send email using your domain. It is the first of the three email-authentication standards — alongside DKIM and DMARC — and since 2024 it is no longer optional: Google, Yahoo and Microsoft now require bulk senders to … Read more