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Blocking ODT file formats also blocks Office docs

After reading an article alerting to the fact that malicious actors are now using OpenDocument file types to bypass filters, I decided to add each of the Open Document file types to a restricted attachment rule within our SEA which strips the attachment from emails where the attachment meets a certain file type or name:

*.odt

*.ods

*.odp

*.odg

*.odf

However as soon as I did this, the SEA started blocking all .docx and .xlsx files.

Would anyone know why?



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