Import emails in batches
There is a Mail Importing feature in Site Import extension, but it is possible only to migrate emails one by one. It would be great if there is an ability to migrate a couple of mailboxes at once.

Thank you for your input! We will consider this functionality in upcoming releases if it will be popular.
Everyone, please continue voting for this feature if you consider it important.
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IG
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Roger Rehnelt commented
I fixed this several times with the free imap-sync on Debian-based machines.
You can use CSV-lists with hostname, user, pw to import massive user-mailboxes.
https://github.com/imapsync/imapsyncBefore importing, you need to create mailboxes. There is a script:
https://support.plesk.com/hc/en-us/articles/12377375225367-How-to-create-several-mailboxes-on-a-Plesk-server-at-once-using-a-single-command-or-a-script