Do you have use strict; and use warnings; enabled? Can you confirm that the report file is actually being written out?

It isn't as simple as you having the system line that does the mailing commented out, can it? Note that it's missing its closing single-quote, but that doesn't matter... $d won't interpolate within single-quotes, so change them into double-quotes.

Also try closing the file before sending the mail: close F or die $!;. You should also avoid using bareword file handles, and use the three-arg open: open my $wfh, '>', "Report_$d.txt" or die $!;, then replace the file handle F with $wfh. Here's an example using a "heredoc" to eliminate the numerous prints:

my $report = <<EOF;

Here is the Results from the Script
-------------------------------------
$PrStat
-------------------------------------
$Mail
-------------------------------------
$Iface

EOF

open my $wfh, '>', "Report_$d.txt"
  or die $!;

print $wfh $report;

close $wfh or die $!;

print "This script has finished!\n\n" .
      "Generating Email!\n\n";

system ("mail test@server.com < Report_$d.txt");
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