Hi,

are you saying you don't want email only when the comments are copied from sc_task to RITM but require when normal comments are added?

I believe for copying you must have done GlideRecord update on RITM.

In that you can use setWorkflow(false) to disable notification.

Note: Using setWorkflow(false) will block all BRs from running on update of RITM

Regards
Ankur