Yeah, that's true. A lot take SPF as an indicator instead of a hard policy. Even
then, it'd be stupid to send a bounce to an SPF hard failed return address, so
backscatter is still limited.
Groetjes,
Louis
Op donderdag 17 oktober 2024 om 18:23, schreef Mark Milhollan via mailop
<mailop@mailop.org>:
> 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.
>
> /mark
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