SPF permerror: the silent policy killer
RFC 7208 Section 2.6.7 is unforgiving
exceed 10 DNS lookups and your SPF result flips to permerror
which most receivers treat as a fail
the insidious part: you can be at exactly 10 lookups today, then a vendor adds a nested include and you're at 12 tomorrow
no notification, no warning
you either use sub-domain for sending emails, or you flatten them
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As I continue to navigate the transition from Google Domains to Cloudflare & Namecheap, I'm reminded of the importance of thoughtful DNS record management.
Conducting a thorough check of hundreds of internal & client domains, I'm reflecting on the wisdom shared by Frank Denis about TTL values.
What are some of your strategies for optimizing DNS settings?
Meysam
Trusty
Billy Presley