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by megous 1118 days ago
Having SPF/DKIM in DNS records doesn't prevent that.
1 comments
LeonM 1118 days ago
This is exactly what SPF and DKIM are designed to do. DMARC enforces this.

Obviously, this is opportunistic security, the receiver must support all this, but >99% does.

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megous 1117 days ago
Yes, but the public testers are not testing the receive side, but the sending side.
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