Get rid of krakozyabr in the mail archive?

Question

gmail

I have an archive of emails from the era when UTF-8 was not yet fully established for electronic correspondence in Russian in Cyrillic. Accordingly, the letters are stored in different encodings and the list looks pretty terrible. In order to read the message, you need to set different Cyrillic encodings each time, until one of them fits, but it's easier to use online decoders. But this is not the case, the long-term and correct solution would be to convert everything to UTF-8. But how do you do this for archived emails? Usually, mailers do not allow editing received and sent messages.
What could be the way out? Directly edit mbox file and fix encodings in it? Export to the database and change the encoding from there, what is the way out of the situation?

Answer 1

I see the only, albeit laborious and doooooolgy way - export to maildir, editing each letter in accordance with the encoding and reverse export. Why exactly in maildir - it's easier to edit letters there. It is possible in mbox.