Cross-platform migrations of the e-mails
Add the ability to perform cross-platform migrations of the emails even for external 3rd party mail services.
For now, it is only possible to use "Mail Importing" feature of the Site Import extension but it only migrates one mailbox at a time.
The alternative way is to use 3rd party IMAP migration tools to copy email content, or copy it manually but this operation was not tested by Plesk.
Please use Plesk E-Mail Migration Module – https://www.plesk.com/extensions/email-migration/