Different roles
SPF checks authorised sending sources; DKIM checks a signature. DMARC aligns checks with the From domain and specifies handling and reporting policy.
FinFly Explains / IT
SPF, DKIM and DMARC
These mechanisms help authenticate email origin, not the truth of every message.
Avoid disruption
FinFly recommends inventorying staff mail, newsletters and website senders before enforcing strict policy.
Not absolute protection
A passing check does not exclude a compromised legitimate account. Verify unusual payment requests independently.
Method
Primary sources
The explainer is checked against these institutional and industry sources. Links open the original material.