Mail app do not export all mails and attachments
I tried to export mailbox. According information in "Account info" size of my folder is 900mb. When I tried to Export mailbox, file "MyMailbox.partial.mbox" is created, but size of that file is just 1mb.
How to export all mails from mailbox with all attachments?
MacBook Pro with Retina display, macOS High Sierra (10.13.2)