A small configuration change was rolled out. Every new incoming IMAP connection would cause a new imapd to be forked and immediately abort and dump core. Each core file would end up with a separate filename. This very quickly caused the cyrus meta partitions to fill up. They reached 100% full before we fully realised what was happening. This caused changes to the mailboxes database to only partially write, causing a lot of them to become corrupted...
Despite the service interruption I absolutely swear by Fastmail. Highly recommended, and rarely, if ever, hacked by the Chinese government...
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