On 06/20/2013 03:36 AM, Robert Richards wrote:
Where in Roundcube's internals can I turn off/change this aberrant behavior?
This is a security feature which matches specified attachment content-type with real (detected by Roundcube) content-type. So, it is possible that this detection doesn't work properly. Check that you have fileinfo extension enabled and Roundcube's mime_magic setting. mime_magic=null should work for most of installations.
ps. you should upgrade to 0.9.2.