Enhanced MIME Type Detection in the Content Filter
We have further improved and simplified MIME type detection in the NoSpamProxy Cloud content filter. New MIME types and those that were previously difficult to detect are now identified more reliably. This provides greater transparency and security, and the more accurate analysis of file attachments supports the evaluation of incoming messages.
Note on Existing Configurations
Due to more precise detection, it may be necessary to adjust existing settings in the content filter.
In the past, some file types were classified less specifically. With the new detection, these are now assigned more accurately. As a result, existing filter rules may no longer function as expected.
An example: Previously, CSV files were often detected as “text/plain,” but are now correctly classified as “text/csv.”
If your filter rules are specifically targeted at certain MIME types, we recommend reviewing them and adjusting them as necessary.
Further Information
These changes automatically provide you with a more accurate analysis of inbound files, giving you a better basis for making security and filtering decisions. The next version of NoSpamProxy Server will also include these changes.
A complete list of all recognized file formats can be found in the online documentation.
