If you use Unreal IRCd, There is an additional option you can add to the Unrealircd.conf, Find this block:
tld {
mask *@*;
motd "MOTD.txt";
rules "RULES.txt";
};
then change it to:
tld {
mask *@*;
motd "MOTD.txt";
rules "RULES.txt";
channel "#brasil";
};
This is done by the IRCd itself, and it will force the user to join #brasil, This also happens before services can identify you, so make sure your channel is not +R (Registered Only Users)
Regards.