Hello @First-NameL29636. At this time, we cannot add custom information into the subject line of a campaign but I will track this feedback for you. I also suggest voicing your feedback and your request for this feature on our Feedback & Ideas board.
Caitlin M. Community Manager Did I answer your question? If so, please mark my post as an "Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.
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