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Zulip sends a handful of emails to new users when they join, telling them their Zulip account details, and introducing them to the Zulip app. You can disable these emails if they don't make sense for your organization. If you do so, you will need to inform users how to log in to their Zulip accounts.

Disable welcome emails

Instructions for all platforms

Go to Organization settings.
Under Automated messages and emails, toggle Send emails introducing Zulip to new users.