Is there a way to edit the subject in emails sent out from Zoho Desk?

At the moment I get:

[##123##] Ticket title

But this is basically impossible to filter on in Gmail, as [ and # are classified as special characters, so can't be used in a filter.

Ideally I'd like to be able to do something without special characters, or the ability to add a custom string at the end which I can filter on?

Using a template doesn't seem to have made any difference to the subject line.