on 1:JOIN:[color:red]#YourChannel[/color]:{
var %address = $right($address($nick,2),$calc($len($address($nick,2))-4))
if (%address == [color:red]some.hostmask.com[/color]) {
msg $nick Hello
}
else if (%address == [color:red]some.other.hostmask.com[/color]) {
msg $nick Hi!
}
else if (%address == [color:red]yet.another.hostmask.com[/color]) {
msg $nick How's it going?
}
}