Why am I getting a bounce email about an email being removed from a thread?
I you received a bounce back email like this:
The following email(s) were removed from the thread: firstname.lastname@example.org.
Please use their @user.commercehero.io email address instead.
...the reason is that you included a regular email address as a CC alongside a @user.commercehero.io email address. We don't allow non-commercehero email addresses to be CC'd as that could leak personal email addresses through the platform.