email-ext sending mail once a day for succeeding job

[David Gang]

Hi all,
 
We have a job which runs every hour.
In order not to get flooded with mails i configured the email-ext step so 
that we will get just mails for fails and for the fixed trigger.
I got now an additional requirement that regardless of the job status a 
mail should be sent once a day. 
So even if the job had success all 24 hours we will get one mail a day.
 
How can i achieve this ?
 
 
Thanks,
David