[otrs] Loop protection

Hi all, One more question :) How mail loop protection works? I made the following test: - mail arrives to otrs from mailing-list - other maillist watchers need to see replys from otrs, so i set BCC to maillist address - but now i get all BCCs to OTRS like followups? Where is the loop protection here? How come it don't ignore such loop? Thanks! Lp, Alex