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Adam Lundrigan

Adam Lundrigan

CTO

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Adam Lundrigan is the Chief Technology Officer of DuoCircle, where he leads engineering and is responsible for the architecture of AutoSPF's SPF flattening engine and DNS monitoring infrastructure. His technical focus is the DNS-level behavior of SPF evaluation, the recursive include resolution logic that underpins flattening, and the monitoring systems that keep customer SPF records healthy as their upstream vendors change IP ranges.

Areas of Expertise

SPF FlatteningDNS ArchitectureRecursive Include ResolutionSaaS EngineeringDNS MonitoringInfrastructure Automation

Credentials

  • CTO of DuoCircle LLC
  • Architect of AutoSPF's SPF flattening and DNS monitoring engine
  • Technical lead for AutoSPF's recursive SPF evaluation logic
  • Leads engineering across DuoCircle's product portfolio

Articles by Adam Lundrigan

Inside RFC 6376: How DKIM Verification Actually Works

SPF PermError vs SPF TempError: What’s the Difference?

SPF Record Examples: Copy-Paste Records for Google, Microsoft 365, SendGrid & More (2026)

How can I reduce DNS lookups reported by an SPF lookup to avoid exceeding limits?

How can I interpret the results from an SPF record checker if I see multiple include mechanisms?

What causes an SPF validator to report lookup limit or mechanism count issues?

SPF Flattening for Growing Domains: Preventing SPF Failures and Lookup Errors

What are the best practices illustrated by an SPF record example to avoid DNS lookup limits?

Advanced SPF Record Testing: Protect Your Domain from Permerror Issues

When SPF Permerror Disrupts Delivery: Hidden Causes You’re Missing