How do I check whether a customer can see my email reply to a discussion in V5?

1. Open the thread you want to reply to and first check the visibility shown at the bottom, such as "Only visible to colleagues". 2. To reply by email, click "Reply by Email" and read the notice on the screen. In this case, the notice states that the thread includes a contact from Northwind Cycle Supply LLC, so that company can also see this email in Patisco. Do not determine visibility solely from the recipient address third-party@example.invalid. 3. Check the recipients, visibility, and content, then click "Send".