As of my last very time consuming thread on optimizing PMG I started a new philosophie with a fresh installation with somehow only adjustments via GUI or shell, which don’t change/touch the system itself, as all such changes like here break any time. So if you’re (also) looking for such feature (I also as well like to see the given from as the envelope often is just a technical sender for bounce handling, especially at service providers for mail like mailchimp, amazonses etc.) vote up for e.g. my feature request on adding this feature to the product itself, may be optional to activate or not, but may be added to the product, so adjustments won’t break. I also had another way to ads subjects and given senders, however, it’s an adjustment which always requires to confirm new configuration files on PMG updates and don’t want to use that anymore.