Yep, that's what backscatter is, isn't it?
Groetjes,
Louis
Op donderdag 17 oktober 2024 om 17:21, schreef Gellner, Oliver via mailop
<mailop@mailop.org>:
> On 17.10.2024 at 17:11 Louis via mailop <mailto:mailop@mailop.org
> [mailop@mailop.org]> wrote:
>
> >> Wouldn't backscatter spamming already currently work the same way with
> messages where the return path address does not align, or with completely
> unauthenticated messages?
>
> > 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. So no backscatter can then be generated by legitimate SPF
> checking systems. Alignment has nothing to do with it, since the from header
> has nothing to do with bounces. If the message is completely unauthenticated
> then yes it's still possible, but then of course you're not using SPF, which
> was exactly the premise of your question.
> > Backscatter spamming is also still easily possible from misconfigured
> systems that don't check SPF, but those seem rare nowadays. They'll be listed
> on backscatter RBLs until they implement SPF checking anyway.
>
> Well ok, but that would require some misconfigured systems which first accept
> the message signed by the spammer domain and then later on decide to bounce it
> because it is spam.
>
> --
> BR Oliver
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