Under '/admin' interface ('/paradmin' under TPAM versions 2.4 and below) via the "Mail Agent | Email Config", the Message Body Tags are available to customize the Message Body.
Is it possible to use these various Message Body tags in the email Subject Lines?
WORKAROUND: This feature is not available in TPAM versions lower than 2.5.919.
STATUS: Enhancement request BFER 2258 has been added in TPAM 2.5.919.
From the 2.5.919 Release Notes from the 'Enhancement' section:
"In email notification configuration, message tags can be entered on the subject line."