Question
How to import a mailbox data from another server or move mailbox data between email accounts in Plesk?
Answer
Mail Importing feature which comes with Site Import extension can:
Migrate mail content from 3rd-party mail services to Plesk.
Move mail content between domains in Plesk.
Install the Site Import extension, if it is not yet installed.
Go to Domains > example.com > Mail > Mail Importing and click Import mail messages.
Fill in the fields:
Specify the email address and password of the source mailbox.
Choose and existing mailbox where mail will be imported or create a new one.
Click Show advanced options for more options.
Click OK.