[otrs] More then 1 system address

I've setup OTRS to use 3 separate queues. IT,Cars,Radios. Each one has its own email address IT@, Cars@, radios@. I've assigned each one the proper email address. But for some reason all email notices are coming from the first email address i created, in this case, cars@. Anyone else had this problem? Maybe i havent set it up right - i've read of others using 1 system account and forwarding others to it. Any help would be appreciated. Thanks. -Scott