A domain's DNS includes the record 'v=spf1 -all', suggesting that emails can originate from any mail server, and thus, messages should be assumed legitimate regardless of the originating mail server.
The SPF (Sender Policy Framework) record is used to specify which mail servers are allowed to send emails on behalf of a domain. The correct interpretation of 'v=spf1 -all' is:
v=spf1 indicates the start of the SPF record.
-all means that no mail servers are authorized to send emails on behalf of the domain. This configuration tells receiving mail servers to reject all emails claiming to be from this domain because they are not coming from any authorized source.
Therefore, 'v=spf1 -all' suggests that any email claiming to come from this domain should be considered illegitimate because no mail servers are allowed to send emails for the domain.
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