Emailing PO pdf ad attachment to multiple IDs in same mail

Hi,

We need to send the Purchase Order copy as PDF to multiple mail Ids (the vendor, the PO creator and the PR creator) in the same mail.

We have managed to trigger 3 different mails containing the PDF to 3 mail Ids.

How can the PDF be sent to all "3 IDs in a single mail" so that all 3 can see to whom all the mail is sent to.

Thanks & Regards