SpamCop anti-spam service suffers an outage after its domain expired

Freek

In case you were suffering from all mails being marked as SPAM, this might be the culprit:

https://www.bleepingcomputer.com/news/security/spamcop-anti-spam-service-suffers-an-outage-after-its-domain-expired/

NodePing

It had our RBL checks confused, that's for sure.

yoursunny

RBL servers are expected to return a response in 127.0.0.0/8 range for a positive response.
If the domain is resolving to parking page, the response is not in 127.0.0.0/8.
Why don't the RBL querier reject such invalid responses?

Sloppy design, sloppy code…