MIME Security Issues

Does anybody wish to express any comments regarding MIME security. I have read the RFC's and any/all doc's I could find on this issue. I understand what the security risks are, but I have been unsuccessful in my attempts to find info regarding what is being done, or has been done to correct this. If I remember correctly, I think I once saw a brief mention of filters or something. I am new to this stuff, so any assistance would greatly appreciated. Thank you, Rick