this post was submitted on 11 Jan 2024
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SPF.
Optional, but recommended. But doesn't guarantee anything unless both sides respect it. Also, IP spoofing is a thing.
Email is a broken protocol. There's a great copy pasta about why it can't or won't be fixed, which I unfortunately can't find. But it boils down to the fact that you can't get everyone to agree on, or implement, the fixes necessary to prevent spam.
Use a host that requires it. Done?