hmm
well /msg nick1,nick2nick3
as you have the text file, try this
Code:
alias msglist {
var %lines = $lines(nicks.txt)
var %i = 1
while (%i <= %lines) {
var %list = %list $+ $chr(44) $+ $read(nicks.txt,%i)
inc %i
}
msg %list $$1-
}

much easier to have all on the one line
nicks.txt :
nick1,nick2,nick3
then:
alias msglist $read(nicks.txt,1) $$1-