[Mailman-Developers] before next release: disable backscatter in default installation

[Julian Mehnle]

Jo Rhett wrote:
> On Tue, March 25, 2008 2:33 am, Julian Mehnle wrote:
> > You can however safely send a DSN if an SPF[1] check for the incoming
> > message passes.
>
> That's not "safe" but perhaps "safer".  But a lot of sites can't use
> SPF so they either don't use it, or use soft-fail.  I would only trust
> SPF results from explicit matches and PASS.

There are two parts to SPF: publishing SPF records for one's domains, and 
checking SPF on incoming messages.  Everyone can do the SPF checking 
part, even if they cannot publish SPF records themselves for whatever 
reason.  SPF's alias-style forwarding issues aside, "Pass" results, when 
achieved, are perfectly reliable and accurately indicate that the 
envelope sender address can safely be bounced to.
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