We'd like to group the deliveries of our recurring automated emails, so that reporting is streamlined. We'd like to execute this by rather than having a seperate 'DM' number for each delivery, we'd like each type of delivery to have a pre-fix before the DM number.
Bizarrely, one of our deliveries has this pre-fix configured (No idea who did this, or how this was done). I'd like to add it to the rest, but i cannot see any difference in the set-up of each delivery or how to configure this for all the others.
As you can see from the below image, we have the 'ACQ-R5' deliveries containing the prefix, however the others don't have this.