my @list_of_file_names = ('file1.txt','another_file.doc','/and/this/file.pdf');
$sender->MailFile(
{
...
    file    => \@list_of_file_names,
}

##</code><code>##

...
$sender->MailFile({
    ...
    file => ['file1.txt','another_file.doc','/and/this/file.pdf'],
})