Resolving the "The DNS Record Type 99 (SPF) Has Been Deprecated" error involves updating existing Sender Policy Framework (SPF) records within a domain's DNS settings to comply with the current standard of using TXT records. Initially, SPF records were designated a specific DNS resource record type, but the deprecation in 2014 led to the preference of TXT records due to improved suitability and compatibility. To fix this error, one needs to convert SPF records to TXT records, ensuring accurate syntax and publishing them in the DNS settings. Validation through SPF lookup tools confirms successful transitions, ensuring proper email authentication and delivery.

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