People sometimes write in and ask, “what is the impact of a broken SPF record”? The net effect of a broken SPF record is that receivers can’t reliably use SPF to determine the legitimacy of the domain’s email. *Some* receivers might ignore the broken parts of an SPF record and... Read more »
October 10, 2015
October 7, 2026
If PTR mechanisms are detected, the current diagnostic output is: Warning: PTR mechanisms SHOULD NOT be used and cannot be resolved using this diagnostic tool. What does the PTR mechanism mean? When an email receiver gets a piece of email and the PTR mechanism is in the sender’s SPF record,... Read more »
October 9, 2015October 7, 2026
If you publish an SPF record and use the a mechanism, but your domain doesn’t actually have an A record in place, then you’ll see this warning. Here’s a sample SPF record that contains the a mechanism (the a is in bold): v=spf1 a include:_spf.google.com ~all The A DNS record... Read more »
October 8, 2015October 7, 2026
Customers sometimes ask us, what does “No DMARC reports received yet which confirm DKIM signing” mean? dmarcian uses DMARC-XML data to detect the presence of DKIM signatures. There is no straight-forward way to query the internet for the presence of DKIM signatures, and so dmarcian relies on the contents of... Read more »
October 7, 2015November 4, 2025
Email is the backbone of modern communication—and the largest distributed application on the internet. With billions of users and millions of mail servers relying on the same core protocols, meaningful changes to email infrastructure happen slowly, requiring years of industry-wide adoption. 2003: 2004: 2006: 2007: 2008: 2009: 2010: 2011: 2012:... Read more »
October 5, 2015September 11, 2026
A dmarcian1dev.wpenginepowered.com user once asked: I can’t seem to find the answer to this question anywhere on the internet (it may just be me not fully understanding the standards), so I thought I’d ask you. If I have DMARC set up in my DNS (which I do) and also ADSP... Read more »
October 4, 2015April 13, 2023