possibly too generic for good future-proofing). This is because _ can't appear in mail domains which is where SPF records appear.
Except when people publish SPF wildcards, which they do.
Exactly. The reason people are caling for version information in DKIM records is not because of wildcard use in DKIM records, but because of slopover from wildcard use in other TXT records, especially SPF. Ned
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