Adds duplicate start line to the beginning of each subsequent file

[prphntm63]

I think this line

file_put_contents($current_mail_file_path, $buffer, FILE_APPEND);

should be

file_put_contents($current_mail_file_path, $current_mail , FILE_APPEND);

Workaround: Use a text editor to manually remove the first line of every generated file except the first one