I think what I would do is first write a small test script to see if the config file was being read correctly. Something like (using your config file)

#!/usr/bin/perl 

use strict; 
use warnings; 

use Data::Dumper;

my $cnf_file = q{config.txt};
my %cnf = read_config($cnf_file);

print Dumper \%cnf;

sub read_config {
    
    my $file = shift;
    open my $fh, q{<}, $file
        or die qq{cant open *$file* to read: $!};
    
    my %cnf;
    while (my $line = <$fh>){
        chomp $line;
        next unless $line;
        next if $line =~ /^#/;
        
        my ($key, $value) = split /\s+=\s+/, $line;
        if ($key eq q{To}){
            push @{$cnf{$key}}, $value;
        }
        else{
            $cnf{$key} = $value;
        }
    }
    return %cnf;
}
[download]

output

$VAR1 = {
          'MediumAlarmThreshold' => '2',
          'SMTP_Server' => 'smtp.isp.com',
          'LowAlarmThreshold' => '3',
          'LogRotateHour' => '0',
          'To' => [
                    'emailaddress@yahoo.ca',
                    'someotheremailaddress@yahoo.ca'
                  ],
          'HighAlarmThreshold' => '1',
          'From' => 'Script@domain.com'
        };
[download]

As you can see, the To key holds an array ref. Which is, apparently, what Mail::Sender requires.

If the output is indeed as you expect I would consider a second test script which just sends a dummy email to those email addresses.

This approach has many advantages. You take on one problem at a time (which is my top limit :-) and you end up with a collection of subs you are confident with. Also, if you hit a particular snag with one of the subs you have a simple script that you can post here and which monks can download and run. This approach, in my experience, will result in a lot more help and solutions.

Try the script above. If it appears ok, write your test_send_email and see if that's ok.

If there are still snags, you know where we live. :-)

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