Walt Mankowski via plug on 2 Jan 2022 03:12:31 -0800


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[PLUG] Microsoft Exchange year 2022 bug in FIP-FS breaks email delivery

Hi everyone,

I just read about this on my work Slack. I know there are some Microsoft admins on the list so I thought I'd pass it along. And for everyone else, well, it's just a bizarre bug.

Exchange's spam and malware checking engine was storing dates in a signed 32-bit integer. The date value for 2022-01-01 is 2,201,010,001. Since this is bigger than 2^31 = 2,147,483,648, this prevented mail from being delivered. You can read more at https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-year-2022-bug-in-fip-fs-breaks-email-delivery/.

Microsoft posted a fix late last night at https://techcommunity.microsoft.com/t5/exchange-team-blog/email-stuck-in-transport-queues/ba-p/3049447.

Walt

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