DigInterface Blog
Tutorials and reference articles on DNS, email authentication, networking and developer tools.
DKIM Signature Failed: 7 Common Causes and How to Fix Them
DKIM signature failures fall into a small set of recurring causes. Here are the seven you'll actually hit in production, with how to diagnose and fix each.
How to Read a DMARC Aggregate Report (the XML, decoded)
DMARC aggregate (RUA) reports are XML files that look intimidating but tell a simple story. Here's how to read one, what each field means, and what to act on.
What is an SPF Softfail? Understanding the ~all Qualifier
SPF softfail (~all) tells receivers an email probably isn't authorised, but to deliver it anyway. Here's what it means, when to use it, and when -all is safer.