Well, the code provided does no sorting. What is it you want it to do?

If you want it to basically do what it's doing, but return the output in sorted order, this should work.

my $editlist = $FORM{'list'};
open(FILE, "$datadir/$editlist.txt") or
   error_message("Can't find data file - $datadir/$editlist.txt.");

my $ccc = 0;
my @out;
   
while (<FILE>){
    my ($two, $one, $nochop) = split(/,/);
    if ($one =~ /.*\@.*\..*/)
    {
        push @out, "$two,$one\n";
        $ccc++;
    }
}
close(FILE);

print sort @out;
[download]

Otherwise, you'll have to be a bit clearer about what you're expecting. I made a few incidental changes, reading the file in one line at a time instead of all at once, etc, but they're just for style. The heart of it is, instead of outputting one at a time, push them into an array you can sort and output. If that's what you want to do.