Cutom reception

Ideally, pass the post ID as a parameter for that recipient. So your recipient should have the resolvable input where you’d put ie {post_ID} merge tag. The Recipient parse_value function would get the post ID.

It probably would be significantly easier with our Custom Fields extension. You could select just the Email recipient and use merge tag: {postmeta {post_ID} meta_key_with_email_address}