Broadcast eMail - usage of eMail saved in Attribute of InfoObject possible

Hi Experts,

I need to do a Broadcast of a web template as PDF via eMail.

In the web template there is a query with the customer number in rows. As an attribute to the customer number we have the eMail of the key account manager - who is to receive the eMail.

Of course only those key accountants whose customer numbers are in the query, are to receive an email.

How can I use the eMail in the attribute for the mailing?

I have only seen that you can dirctly type the eMail adress, but not how to use the value of an attribute - but I read that this is possible...

Thank you for your help!

Angie