Sent e-mail notification with attachments

I want to send an e-mail to a recipient outside of Zendesk and I want to have the e-mail sent in the background from the main ticket without creating a side ticket. I want to add the tickets attachments to it and to have a specific subject that takes value from the organizational custom fields. I tried with a target and trigger, but I don't see an option to add the attachments. Any suggestions?