SPF, DMARC, and DKIM

SPF (Sender Policy Framework) is an email authentication record, which is essentially used to define which specific servers are permitted to send mail on behalf of a domain.

https://docs.ukfast.co.uk/email/spf.html

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Adding an SPF record

useful SPF record generator tool

SPF records need to be added as a TXT DNS record.

example:

"v=spf1 mx a ip4:185.216.77.122"