Add DNS to MIME type filter?

Security
1

im looking into adding MIME types i want to block on my network into the MIME type filter in ipfire to limit liabilities from things i dont use and increase network security.
i have found a mime type for DNS at
iana.org

Screenshot from 2020-03-27 08-01-18
Screenshot from 2020-03-27 08-01-181366×741 145 KB

does anybody know if it would break ipfire to add 1 or all 3 dns to the MIME content filter?
would it be more secure?
i was also thinking of adding EmergencyCallData
any feedback is welcome

2

ok so the answer is yes you can add it to the MIME type filter. i have snse added the following to the MIME type filter
image/vnd.microsoft.icon application/dns-message application/dns+json application/dns text/dns text/cache-manifest
im fairly certain that this improves security on the network. if anyone finally reply’s to this let me know