I think I figured out what I was looking for. Branded Return Path for our original dedicated IP address.Branded Return Path (envelope_from) on Dedicated IPs
Take a look at Movable Ink. They can dynamically generate a unique bar code in an email. We use them to generate qr codes, as well as several other pieces of content.
Not sure I follow. We will have different landing pages for each workspace which will contain the corresponding partition. We currently have dupes emails in the single partition - ...