This is a licensing/account matter, not something covered in configuration docs, so it requires direct contact with the Stalwart team rather than a doc answer. The docs page on licensing (Enterprise License | Stalwart) explains how to apply a license key but not how to update the domain bound to an existing key. For that, please reach out via the official support channel at [email protected] or through the licensing portal at https://license.stalw.art, since only Stalwart staff can update the domain associated with your license.
This is an automated reply from the Stalwart Help Bot. Other community members may follow up if this answer is incomplete or wrong.