How do you archive, deduplicate and search e-mails offline?

[youseecomrade]

I have thousands of emails from multiple accounts. Some of them are .eml and others are entire .mbox mailboxes.

I would like to be able to search them and also import new emails (manually, I'm not going to connect to IMAP or anything else). It would need to ignore duplicated e-mails e.g. re-import a Google Takeout .mbox without creating complete chaos.

- [e-mail] -- inbox -- sent -- folder1 -- folder2

- [e-mail] -- inbox -- sent -- thingsishouldnthavesent

[Alex3917]

You can search them using Stanford's ePadd software.

edit: For deduplication you can use Aid4Mail, MailStore, or BitCurator.

[dredmorbius]

Mutt. Notmuch. Offlineimap.