On Thu, 17 Oct 2024, Louis wrote:
If spammers were to use my email in the return path/envelope from with the intent on causing backscatter, the emails will be rejected at SMTP time due to SPF failure.
FYI, You might not believe it but not everyone checks SPF much less at SMTP time. They may use failures, even "hard" ones, as a negative indicator that other things can mitigate allowing the message to reach the user (inbox or otherwise) -- mostly they don't bounce but some do which might result in being added to some DNSBL ... unless they're too large to risk blocking, or for any other reason.
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