✉Re: an interesting article

Peter Corlett abuse at cabal.org.uk
Tue Jul 25 11:04:54 CDT 2017


On Tue, Jul 25, 2017 at 08:33:16AM -0700, geneb via cctalk wrote:
[...]
> For example, if you sent classiccmp.org an email with your "from" header
> tweaked to be from geneb at deltasoft.com, the mail server will reject it
> because your mail server isn't an authorized sender for the deltasoft.com
> domain. If it doesn't, someone needs to give Jay a stern talkin' to. ;)

It'd be wonderful if SMTP mail worked like that, but sadly it doesn't.

In this case, deltasoft.com doesn't even have a SPF record, so the de facto
default policy applies where any mail client can send mail from that domain.
SPF is no magic bullet either, because it's often misconfigured, and a hard
rejection on SPF failure is likely to bin a lot of legitimate mail.



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