weird kmail behaviour

I don't know if this happens to anyone else but I receive mail addressed to support for my department. When I hit reply to all only the sender's address appears in the "To" section. However, I noticed that if I hit reply to all on a message from the suse list both the sender and the suse addresses appear. There is one significant different between the two senarios and that is I use a different "identity" for my support mail. Does anyone know what's going on? Thanks Eddie