my $cmd = 'mail -s "Test" testmail@server.com, < DailyReport_$d.txt';
print "Running [$cmd]\n";
system($cmd) == 0
    or warn "Couldn't run [$cmd]: $! / $?";

##</code><code>##

my $cmd = "mail -s 'Test' 'testmail\@server.com' < 'DailyReport_$d.txt'";