Real mail addresses in list postings and resulting **SPAM**

Does anybody have a good idea how to avoid the appearance of real mail addresses in the body of postings to fedora-devel/test-list when people reply to an earlier message? Could additional technical measures be taken to remove or alter them such that they cannot be harvested by third parties? It seems that the problem is amplified by sites which mirror the original list without taking the same measure to obfuscate mail addresses, e.g. by filtering out the commercial at sign. Thus the problem is not one of how Fedora list archives are managed/displayed but rather one of preparing incoming messages before postingthem to the list subscribers. Any subscriber could help of course by removing/obfuscating real mail addresses in the message body before posting it to the list. Thanks, ~C.