Importing Mailboxes from a CSV File

You can import primary mailboxes together with their alias mailboxes and environments from a CSV file.

Instead of entering mailboxes manually in the Control Panel, you can import mailboxes from a CSV file. You can import mailboxes both initially, before any other mailboxes have been created in the Control Panel, and additionally at a later time. You can either update or remove the entries that already exist in the Control Panel. During the import, primary mailboxes are imported together with their alias mailboxes and environments into the Control Panel.

Note:

Microsoft 365 mailboxes and mailboxes synchronized via LDAP cannot be imported from a CSV file.

  1. Log in to the Control Panel with your administrative credentials.
  2. From the scope selection, select the domain for which you would like to import mailboxes.
  3. Navigate to Customer Settings > Mailboxes.
  4. Click on Import CSV.

    A menu opens.

    Figure 1: Menu for the CSV import of mailboxes
  5. Click on Upload file.

    A file selection window opens.

  6. Important:

    To ensure that an external CSV file can be imported into the Control Panel without errors, rules regarding the file format, structure of its contents as well as a valid syntax must be observed (see CSV Files for Mailbox Import).

    Select the desired CSV file.

    The Control Panel reads the CSV file and displays a summary of the mailboxes to be added and updated as well as the invalid CSV entries and the error type.

    Note:

    For more information about the errors listed here, see Mailbox Import Errors.

  7. Optional:
    CAUTION:

    During a CSV import with the option Delete all mailboxes from the system, the existing mailboxes in the Control Panel are overwritten.

    To prevent data loss, export the available mailboxes before performing the import.

    To delete all mailboxes from the system before importing new mailboxes, check the Delete all mailboxes from the system checkbox.
  8. Click on Import.

    The mailboxes listed in the summary are added or updated. The results of the import are then displayed.

    Note:

    For more information about the errors listed here, see Mailbox Import Errors.

  9. Click on Close.

    The summary of the import is closed.

Mailboxes have been imported from a CSV file and added to the domain in the Control Panel.