A single MailWizz license is intended for . If you need separate installations for an internal and external domain, you would typically need a separate license for each. However, a workaround exists: you can install MailWizz once on your primary public domain and then set up the internal domain as an alias (CNAME or virtual host alias) that points to the same installation. You can then use server-side rules to restrict public access to the alias, effectively using a single installation for both purposes.
To prevent license key exposure in version control or logs: mailwizz license key
To get the most out of Mailwizz and your license key, follow these tips and tricks: A single MailWizz license is intended for