Changing a mailbox name = mailbox migration

Unfortunately, SmarterMail does not support renaming a user. To work around this limitation, create a new account, then log in to that account via https://poczta.dcsweb.pl and use the Mailbox Migration option to transfer messages from the previous mailbox.

After logging in, open Settings and choose Mailbox Migration:

In the new window, for Account Type select Other and click Next:

On the next step tick Email and click Next:

Fill in the details of the old account from which messages will be transferred. After verifying the connection with Test Connection, click Next:

In the final window click Start and wait while the messages are migrated:

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