Add a user line below SUBJECT
For example my postal service sends me a notification which contains the tracking number when I receive a package. Often the seller has sent me a notice containing the tracking number. If I were able to add the tracking number to the user line (or the subject line) I could match them up and delete them. As it is I have to open each item several times in order to match them. Also the subject line does not always reflect what is important to me.
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