Newsletter Email Archiving

I use email archive manager to refer back to on occasion, so I want to leave "Email Archiving Active" set to true. I do not however need to keep over 1600 copies of my monthly newsletter. How can I disable the email archive function for my newsletters, but not email?

/admin/includes/modules/newsletters/newsletters.php

change line 102 fromzen_mail($audience->fields['customers_firstname'] . ' ' . $audience->fields['customers_lastname'], $audience->fields['customers_email_address'], $this->title, $this->content, STORE_NAME, EMAIL_FROM, $html_msg, '[B]newsletters[/B]');to:```
zen_mail($audience->fields['customers_firstname'] . ' ' . $audience->fields['customers_lastname'], $audience->fields['customers_email_address'], $this->title, $this->content, STORE_NAME, EMAIL_FROM, $html_msg, '[B]no_archive[/B]');

Thanks!

I have the paypal debug logs set to email to me, what would I need to change in what file to have them not be archived also? I already used the code above to disable the newsletter archiving, thanx :)