How can I make an email account readonly?
We use several IMAP accounts as archives and I want to be able to search them in the global search and look through them, but safeguard against accidentally deleting an email there for example. In the ideal the whole account or nominated folders in it are flagged read-only and cannot be modified. Alas cannot find a way to do this in the UI nor with Google's help. So hopefully there is a way and someone can help me find it, and if not, convert it to a feature request!
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Do these accounts receive new messages on a continuing basis? If so, it wouldn't be possible to set the underlying mbox files (the files in the profile folder that contain the messages) as read-only, since all messages in a folder, new and old, are stored in a single mbox file. Perhaps it would suit your purposes if you periodically exported folders to mbox files with ImportExportTools, marked the files as read-only, and then imported them to TB as needed to search or view, but not modify.
ImportExportTools has options to perform scheduled backups of the entire profile or just the mail files, or just the changed files.
MailStore is another option for archiving mail, and it works with TB.
There is also a simple add-on that offers some safeguard against accidental deletion: CONFIRMBEFOREDELETE.
Keep in mind that even if a message is deleted, it can usually be recovered via an add-on as long as the folder hasn't been compacted,
Alas making the folders readonly is not an option, they reside as accounts on an Exchange server run by the business which serves them to me via IMAP at home, so I can search these archives. I'll try those addons as they sound modest comprimises. Thanks for the tips!
A shame mind you that a whole account can't be marked as "Readonly" so even if it's receiving messages form another client or being delivered I could turn this client (Thunderbird) into a secure viewer for the account.