Anyone who uses Microsoft’s Exchange server for email traffic, for example within the Microsoft-365 package, is currently being displayed. Since midnight, numerous emails have started with the subject “(external)” – even with emails that come from work colleagues within the same company.
On Reddit is circulating a quote from the Microsoft Support From the admin news center: “We are currently investigating a recently made code change in the ‘Set-Externalinalinoutlook’ function, which we suspect is responsible for confirming this. To confirm this, we collect traces of content from the affected email messages to identify the code that means that the subject lines are unexpected ‘(external)’.
Regardless of settings and mail client
The bug also occurs when the external identification is completely deactivated. Since it affects Microsoft’s Exchange, it also appears regardless of the mail client used, such as Outlook or Thunderbird.
The troubleshooting should be quite trivial for Microsoft. Obviously, users themselves cannot do anything about it at the moment.
At least in some companies, the mistake seems to be fixed again.
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