Send automated email when a sales order contains a certain product

Send automated email when a sales order contains a certain product

Hi,
we have a custom field defined in the PRODUCT module, let's say customtype.

Now I want to implement a new workflow rule which sends an email to certain people, if a sales order gets created which contains products where customtype="abc".

How can I do this? Seems simple, but I don't find a way...

ZOHO CRM must allow workflow rules to access the product list which a sales order contains, otherwise workflow rules are not helpful in any way.