One of the short-cuts of Zimbra Web Client (mail) in not very accurate:
It makes appear the destinator list.

Nevertheless, Ctrl+C is the classic (historically Apple, and then Windows for a few years now) short-cut for "Copy".
So, the special shortcut in place in Zimbra Web Client is annoying?

Can we deactivate it?

Or, can you change it in a next version?

Usage: Zimbra Web Client (with Free, french internet provider)