Send PO to vendor's email addresses using external send

Hi Experts,

I am trying to send a Purchase Order to vendor thru transaction ME22N1/ME22N. I maintained two emails of vendor in vendor master XK02. The standard program is sending only one email which is working 100% fine. But I need to send email to two email address of the same vendor like vendor@yahoo.com and vendor@gmail. I am using output type ZU01, print program SAPFM06P and SAP Script ZMEDRUCK. I tried debugging SAP standard print program SAPFM06P and could find a point where exactly I need to add the code to send emails to vendor. I am kind of loss. I would really appreciate if anyone of you could suggest me the steps to do. sample code is really appreciated.Please help.

Thanks,

Nani.