People keep believing that SPF is to filter SPAM. That's not the target.
SPF can *only* say if an e-mail is forged or not.
If you setup in SPF that from lwn.net only host 184.108.40.206 is allowed to
send, and some server checks SPF and gets a mail from lwn.net from host
220.127.116.11, then it can discard it as forged. That's it.
The fact that SPAM very often sends with forged addresses is just a side
effect. There are other tools for SPAM.
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