What version of OTRS? What OS? How did you install? Did you search for otrs mod_headers? Did you try anything related to what you found?
OTRS 6.0.x (private/testing/public) on Linux with MySQL database.
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Ok so version of OTRS is 3.3.3 I install this on ubuntu 12.04 LTS. Yes i search for mod_headers and i change options in SysConfig in Ticket -> Frontend::Agent::ToolBarModule, one guy in this forum give me that advice, but i still have "Check if the system uses mod_headers. You should enable mod_headers." on Support Assessment.