"SPF records typically conclude with -all, ~all, ?all, or +all, each defining the authorization status of emails based on previous mechanisms."
"The transition to ?all signifies a neutral stance, where the sender does not assert whether emails from non-listed IPs are authorized."
"While -all is strict and can block legitimate emails, ~all allows for some flexibility, accepting emails from non-listed IPs as potentially legitimate."
SPF records end with -all, ~all, ?all, or +all, indicating the authorization status of emails. +all is ineffective, while -all is strict and can block legitimate emails. ~all allows for some flexibility, accepting emails from non-listed IPs as potentially legitimate. ?all indicates no assertion on the authorization of emails from non-listed IPs. The shift to ?all reflects a change in how SPF results are interpreted, especially in relation to DMARC evaluations.
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