 | SaaS |  | DCI / Gateway |  |
What is the issue?
Legitimate email with the MIME type application/octet-stream is being blocked as "Banned".
What causes this issue?
The application/octet-stream is a MIME type that is generically used for attaching several types of files to messages, including:
- Images
- Executables (including viruses)
- .doc and .xls files (including those with viruses)
- .docx and .xlsx files (that are legitimate)
- .pdf files (that are legitimate)
- .ZIP and other archive
- others
Given the generic nature of this MIME type, it should never be used either to block or allow in Content Filtering > Attachment > Mime Type Filters.
What is the solution?
Go to Content Filtering > Attachments > Mime Type Filters.
If "application/octet-stream" is listed in the Mime Type column, delete the entry by clicking the delete X icon in the Options column.
Click Apply at the bottom of the page to force the setting to take effect immediately.