How to Create Several Mailboxes using CSV

To add several mailboxes in a single action, go to the menu Emails > Addresses > Add several mailboxes.

The file for importation should be in CSV format, which you can create with spreadsheet software - like Microsoft Excel or LibreOffice Calc. Example:

The first line of the file should always contain the name of the field for each column. The API documentation shows all possible options. The blank fields are assigned default values.