3 ms·
It's not part of SMTP, it's part of the cludge of anti-spam measures we bolted on top of it.
by _joel 3y ago
It's not part of SMTP, it's part of the cludge of anti-spam measures we bolted on top of it.
- micah94 3y ago...bolted on top of DNS.
- _joel 3y agoSure, 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 :)