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7/24/2026
How to Check SPF, DKIM, and DMARC Records in Python

How to Check SPF, DKIM, and DMARC Records in Python

Short summary

A practical Python tutorial for querying SPF, DKIM, and DMARC DNS records using dnspython, with code snippets for each record type and a combined audit function. Covers the SPF 10-lookup limit, DMARC policy levels, and the DKIM selector discovery problem. Ends with a brief pitch for the author's Bulko email tools.

  • •SPF, DKIM, and DMARC are the three DNS records that determine email deliverability
  • •Python code using dnspython to query and validate each record type
  • •Common pitfalls: SPF lookup limit, DMARC p=none, unknown DKIM selectors

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