For Google Workspace.
For Microsoft 365.
I've got a virus detection alert stating that "POLICY_FORMAT_MIME_BOUDARY".
The sender scanned the attached file, but no virus was detected. Please tell me the reason.
Sample of the e-mail
This virus detection alert email was sent, not because a virus exists in the email body, but because an invalid strings was included in the boundary (strings which indicate the boundary of email contents) and the system considered it a virus detection.
A possible cause is a control code (escape character, newline character, NULL, etc.) or double quotations immixed by a client application which created the email, or a server on the email path when boundary strings were created.
Strictly speaking, that is not a virus detection, howeve, HDE One service reports the case as a user notification. If the same phenomenon occurrs, resending the email may resolve the problem.