Hey Dan, we can confirm both the lookup fails and the ATTR2 errors. Looking back in the logs, we start seeing the lookup fails since about 08:04 UTC.
-- Kevin Kelker (Postmaster), Mittwald CM Service GmbH & Co. KG ________________________________ Von: mailop <[email protected]> im Auftrag von Dan Malm via mailop <[email protected]> Gesendet: Mittwoch, 6. Juli 2022 11:41 An: [email protected] Betreff: [mailop] Delivery and DNS issues for Microsoft / m365 Hi, We're seeing a lot of DNS errors for *.mail.protection.outlook.com at the moment. NS lookup for mail.protection.outlook.com resolves to two hostnames that in turn resolve to the same IP. What IP they both resolves to varies over time, and one or more of those IPs doesn't respond at all on port 53, so whenever the non working IP is cached we can't lookup MX records for m365 customers for a while. The DNS servers we can reach also don't support edns or qname minimization... And when DNS doesn't fail we have a lot of deliveries respond with: Temporary server error. Please try again later ATTR2 [GV0CHE01FT017.eop-che01.prod.protection.outlook.com I'm assuming we're not the only ones seeing these problems at the moment? https://portal.office.com/servicestatus lists issues with outlook.com but the description there doesn't seem to fit what I'm seeing. -- BR/Mvh. Dan Malm, Systems Engineer, One.com
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