Color change in Subject of Email

Hi All,

    we have a workaround for reading the mails from shared mailbox, where the UUID of the process model has to be added in the subject of the mail, which looks something like below,

    Testing [DestinationPMUUID=0002e5fe-f50a-8000-1ced-014d98014d98]

    How can we change the color of this UUID in the subject, so that it will not be visible for the users.

    Thanks in advance.

Warm Regards

Vineeth