[Lk7Of3vfJS2n]

I don't know if IP range reputation is part of SMTP but I wish sending email worked without it.

[_joel]

It's not part of SMTP, it's part of the cludge of anti-spam measures we bolted on top of it.

[micah94]

...bolted on top of DNS.

[_joel]

Sure, in addition to this though. IP reputation comes from spamhaus.org and the like and implemented in spamassassin or something similar, at SMTP(ish) level.

What you're talking about there is SPF/DKIM etc, which is an anti-spam measure but not IP reputation :)