this post was submitted on 23 Oct 2023
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Privacy
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SPF/DKIM/DMARC does not prevent sending the spoofed message, though. It is up to the recipient system to filter out the message should the checks fail. Even then, the message often lands into spam instead of being dropped.
Anyway they should configure their systems to reject unsigned e-mails and providers that don't have a proper SPF configuration. SPF (Sender Policy Framework) allows you to make sure that the message was sent by an approved server and was not forged by some hackur.
You'd be surprised how many legitimate email are sent with failed SPF. Even Microsoft sometimes doesn't update their MX records and the SPF fails.
That is especially true with large organizations where multiple non-technical teams are ordering/configuring products that send email.
Unfortunately it is difficult to solve, unless services stop allowing sending without verifying and forcing proper configuration. That would drive sales to competitors who do not enforce this, though.