How to rename users or domains in IceWarp

Renaming a user: The best way to rename a user is to add secondary alias, because people might send emails to the old user name.
Renaming a domain: The best way is to create a domain alias.

Create an alias by:

Adding an alias to an existing domain.
Create a new domain with type Doman Alias – allows the possibility to create custom rules.

Always dump all Databases first.

Always create a backup of storage (config, mail, archive).

Always rename a domain via the WebAdmin.

Check that the option API c_domain_cannot_be_renamed is set to false.