Hi all,
The European Commission has published a comprehensive study on DNS abuse:
Study on Domain Name System (DNS) abuse, 2022
https://data.europa.eu/doi/10.2759/616244
Study on Domain Name System (DNS) abuse : technical report. Appendix 1, 2022
https://data.europa.eu/doi/10.2759/473317
Chapter 17 of the Appendix (2nd link above) contains data on SPF and DMARC.
The DMARC part says that 8,129,795 out of 246,425,997 domains exhibit a DMARC
record (3.3%). Parsing DMARC records shows that 49.68% of the domain names
with the DMARC record has p=none, 11.20% have p=quarantine, and 37.14% have
p=reject.
Best
Ale
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