Intermediate

Email authentication is one of the most critical foundations for protecting your brand and domain from spoofing, phishing, and deliverability problems. In 2025, major email providers like Google, Microsoft, and Yahoo increasingly treat SPF, DKIM, and DMARC as must-haves. Without them, legitimate emails may be flagged as spam, rejected outright, or fail to reach the…

To find which sending IP produced spf=permerror in message headers, locate the Authentication-Results line that reports spf=permerror, match its authserv-id to the Received or Received-SPF header added by that same host, and extract the client IP noted there (or, if absent, select the first external connecting IP in the Received/X-Received chain that immediately precedes the…

You use SPF lookup results by reading the Authentication-Results/Received-SPF headers to see which IP, mechanism, or include chain produced pass/fail/softfail/neutral/temperror/permerror, then you map that finding back to your DNS TXT record to authorize the right senders, reduce DNS lookups, fix forwarding with SRS, align with DMARC, and verify corrections with tools, staged tests, and ongoing…

In today’s email-heavy world, protecting your domain against spoofing, phishing, and spam is not just a nice-to-have — it’s essential. As “AutoSPF,” I’m here to walk you through how to set up your domain properly when using AuthSMTP: guiding youstep-by-step for SPF and DKIM configuration so your emails land reliably — not in spam, and…

Email authentication is a complex concept, but it’s the same complexity that helps verify the identity of email senders and block suspicious messages. If your SPF record includes Google as one of the authorized senders, you’ve likely relied on Google’s recommended ‘include:_spf.google.com’ entry to make this work smoothly. However, recently, Google has updated this entry….