The user may at any time create a new mailbox, and choose the loginthat is more like it. Of course, in the new mail , all folders will be empty emails from the old mailbox will not be automatically migrated to the new mail only for the reason that the user thought to be called differently. What you can do in this situation?
An example is given for the service "Yandex.Mail." Other mail services operate the same way. Open the search engine Yandex. If you are logged into your old Inbox (or automatically), log out. In the left middle of the page, under the field intended to access email, locate and click the "Make mailbox". Or visit at and click to "Get mail" in the center of the page.
Go through all the steps of registration: specify the name and choose a usernameby which you login into your mail. Create a password, confirm it, select a security question, give the answer. Enter the phone number and alternative e-mail (you can indicate your old Inbox). Confirm registration and log in to your new mailbox.
To emails from the old mailbox came to new emails, configure mail fetcher. For this purpose in the upper right corner of the page, click on the link "settings" (it is located under the address of your mailbox). On the settings page, click the "Collect mail".
In a new window in the field E-mail specify the address of your old mailbox and password for it. Click on the "Enable garbage", wait until the service will validate the entered data and will connect to your old mailbox. Select the desired setting. Now letters at your old address will be automatically redirected to the new mail.