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They are used to prevent mail bouncing happily back and forth between GNARWL and another automated MUA (which can really generate a lot of network traffic and fill disks very fast). With the blockfiles, gnarwl keeps track on who already got an automatic reply, and makes sure s/he doesn't get another one too soon. The badheaders may be used to prevent gnarwl from replying to a mailing list. If an email contains a header line, which is listed in the badheaders list, GNARWL will simply ignore that email.