There is a bug with the "reply" functionality that's really annoying. Here's how you reproduce:
- Hit the "Reply" button in a Ticket
- Paste the following text into the cc box:
"User, Test" <user@domain.com> - Move the cursor out of the cc box
- --> You'll see the cc'd email address as two separate recipients
I posted a similar bug 8 months ago (https://support.freshdesk.com/support/discussions/topics/17312/page/last#post-34648) but it still hasn't been fixed.