The traffic to/from the DNS server would also be reduced if name servers
send the A, PTR, or MX info in the ADDITIONAL INFO part of the DNS
response.
Query:
sender.com IN TXT
Response:
Answer: sender.com IN TXT 'v=spf1 +a -all'
Additional info: sender.com IN A 192.168.0.142
Or
Response:
Answer: sender.com IN TXT 'v=spf1 mx -all'
Additional info: sender.com IN MX 10 mx1.sender.com
sender.com IN MX 20 mx2.sender.com
mx1.sender.com IN A 192.168.0.142
mx2.sender.com IN A 192.168.0.143
DNS servers do this today with MX records, in the fullness of time we'd
expect the same for SPF records.
Cheers!
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