Zulip uses your full name as the primary identifier facing other users. Depending on the organization's configuration, a user's email address may or may not be

Zulip uses your full name as the primary identifier facing other users. Depending on the organization's configuration, a user's email address may or may not be available as well, but we just need your name (and auto-generated user ID) to display messages. https://zulipchat.com/help/restrict-visibility-of-email-addresses https://zulipchat.com/help/restrict-visibility-of-email-addr...