How to change default output cronjob

When a user creates a cronjob, the default setting is to send all output to their useraccount-mailbox. This is a setting at the bottom of the 'cronjobs' page, called "Send all Cron output to E-Mail". Much customers have a cronjob running every minute and are not aware of this setting, which cause to send a email every minute to their default account (which they don't check). One mail has a size of 4KB, which leads to 349MB per month. Because of this many of my customers hit their quota limits very fast, of course.

Is their any way to set a blank email-address as default for this setting?

Thanks in advantage,
Marijn

Note: As English is not my native language, it's sometimes hard to follow my story. Thanks for taking the time to read and decrypt it, haha.

if you want to blackhole cron emails you have to set MAILTO=""

Not sure how you do it with directadmin though.

You might have to request a feature request.

I want that as the default setting for all user's, yes. So when an user wants to mail the output of a cronjob he has to conscious choose for this.

This feature http://www.directadmin.com/features.php?id=943 is at your service, with that you can do anything you want or need after a new crontask is set, or an existing one was modified.