Download of MacMister IMAP Backup 1.2 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This Mac application is a product of MacMister Solutions. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
How to backup IMAP emails to local system on macOS? If you are also searching for a solution to this query then download IMAP Backup Tool. Its an all-rounder utility that allows users to save their IMAP mail folders to PST, PDF, EML, MBOX, MSG, OLM, CSV etc. You can also use this Mac IMAP Backup Tool to transfer IMAP mailboxes to another IMAP account, Office 365, Outlook.com, Gmail and other cloud services.
You may want to check out more software for Mac, such as MacSonik IMAP Backup Tool, Mail Backup X or MacMister CSV Splitter for Mac, which might be related to MacMister IMAP Backup.
Backup & Restore
Backup & Restore