On Thu, Jan 22, 2026 at 12:12 PM Mark Alley via mailop <[email protected]> wrote:
> Hey all, anyone else seeing DNS issues with *.mail.protection.outlook.com > FQDNs? Our queues for mail to EXO tenants is growing steadily due to either > deferrals or DNS lookup failures. > Something's definitely up with Microsoft. We're seeing "451 4.3.2 Temporary server error. Please try again later ATTR2". You can see when it started for us by going to: https://groups.io/email-provider-status?isp=Microsoft+365 Mark
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