Send email with attachment from Q2 notification to external email

Hi,

Whenever I create a Q2 notification, I want to send the vendor, details of the notification as attachment. Now it is copying the "coordinator" from partner function. But not copying vendor data in select partner function. Here I have to manually select the vendor. Another question here is that, this email should trigger to the email id of vendor maintained in the vendor master. This email address will be an external id. Please suggest the best way to send email to vendor along with attachment.

Thanks

Vineeth