Didn't even notice, but I do have a couple of reverse lookup failures in my logs during that time now that I come to look. Looks like they were IP that were listed on spamhaus anyway, so the mail server just ignored them still.
Reverse DNS services for subscribers to RIPE - the Regional Internet Registry for Europe, the Middle East and parts of Central Asia - were disrupted yesterday for over three hours. Some users were still experiencing outages this morning. Used to check domain names in email receiver fields, reverse DNS checks are a helpful way …
Netcraft and the Full Disclosure mailing list hit
The mail servers for both Netcraft and the Full Disclosure mailing list have IP addresses that did not resolve during the outage