Fix Issues With Mail Providers Not Identifying SPF Records
Although the SPF record seems to be working correctly, some tools might indicate that the SPF records doesn't exist. With most providers, the SPF configuration is not applied because SPF records were deprecated in April 2014.
RFC 7208 states "SPF records MUST be published as a DNS TXT (type 16) Resource Record(RR) [RFC1035] only. The character content of the record is encoded as [US-ASCII]. Use of alternative DNS RR types was supported in SPF's experimental phase but has been discontinued." For more information, see
Route 53 offers this record type as an available option mostly to maintain compatibility with BIND imports.
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