Correcting Message Dates Corrupted by Apple Mail
In 2016, whilst importing emails into Apple Mail, about 20,000 email were given the date and times of the import instead of the date from the Received Header. Luckily Thunderbird has retrieved the emails from my IMAP server and given them what appear to be the correct dates. Meh knowledge of the tech behind this is very limited. Anyway, my question is, how can I export a fresh mbox or other format of mail folder with Thunderbird applying the correct dates to each of the messages?