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A comment on Fastmail 30 June outage post-mortem.

Re:Fastmail 30 June outage post-mortem by Lk7Of3vfJS2n on Thursday July 06, 2023 @02:28PM (#36620594)
I don't know if IP range reputation is part of SMTP but I wish sending email worked without it.
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Re:Fastmail 30 June outage post-mortem by _joel on Thursday July 06, 2023 @02:53PM (#36620957)
It's not part of SMTP, it's part of the cludge of anti-spam measures we bolted on top of it.
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Re:Fastmail 30 June outage post-mortem by micah94 on Thursday July 06, 2023 @05:42PM (#36623493)
...bolted on top of DNS.
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Re:Fastmail 30 June outage post-mortem by _joel on Sunday July 09, 2023 @07:27AM (#36653587)
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 :)

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