What is SPF Record?
An SPF (Sender Policy Framework) record is a DNS TXT record listing which mail servers are allowed to send email for a domain.
It starts with v=spf1, lists permitted senders with include:, ip4: and similar mechanisms, and ends with -all (reject others) or ~all (soft-fail). Ending in +all authorises the whole internet and defeats the purpose.
SPF works together with DKIM signatures and a DMARC policy; on its own it does not stop spoofing of the visible From address.
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