# I'd like to have a system that would allow me
# to add as many images as possible to my template file here
# instead of multiple hashes, is that possible?

my %img_in;
...
my %img_sec;
...

##</code><code>##

my @imgs = (
    {
        Type        => 'image/gif',
        ID          => 'logo',
        Path        => '/images/logo.gif',
        Filename    => 'logo.gif',
        Disposition => 'attachment',
    },
    {
        Type        => 'image/gif',
        ID          => 'footer',
        Path        => '/images/footer.gif',
        Filename    => 'footer.gif',
        Disposition => 'attachment',
    },
    # ...
);

##</code><code>##

for my $img (@imgs ) {

    $msg->attach( %$img ) or die "Error adding $img->{Filename}: $!\n";
}