Recently I started using imap-backup to back up my (Fastmail) email on my Mac (instead of using MailStore on my PC). This CLI is great for storing email in Mbox format, but it lacks a (GUI) viewer.
What is a good (GUI) Mbox viewer for Mac?
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I back up my email to EagleFiler which works much like an email client when you use it to store MBOX files. But $60 US is a bit much for a viewer.
Why not use Thunderbird mail? It uses MBOX files for folders.
I have an EagleFiler license and actually used this on a previous Mac…
Maybe I should give that a second look.
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+1 on EagleFiler, that’s what I use, but also 
-ing this thread if there are other options because dang it’s … not very pretty.
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Now that you mention it, it is kinda plain looking. I hadn’t noticed that once in the 18 years I have been using it. 
I tried EagleFiler, but it does seem to require me to import the Mbox file into an EagleFiler library, instead of just displaying the Mbox file itself. Since I plan to make weekly backups this would be cumbersome (unless I postpone the import to when I really need to inspect that Mbox file, which hopefully won’t happen that often).
Also, after importing the Mbox, the entire “From” column in EagleFiler was empty, despite all mails in the Mbox having a “From:” line.
EagleFiler will indeed do if needed, but I’m still hoping/looking for something “better”.
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Correct, but it doesn’t modify the MBOX file. It just creates an external index so it can be searched and sorted, etc.
EF also allows me to combine multiple MBOX files and remove any duplicates.
I’ve never experienced that with MBOX files exported from Apple Mail or downloaded from Gmail. Right clicking on the column headers allows me to select desired info.
Hope you find your ideal solution.
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FYI. I just made a new EagleFiler library and imported one of my old Mbox files and dragged another Mbox to the new library’s sidebar. Both of them opened just fine with expected contents in the From column. Even the items I had sent had my name in the From field. My Mbox files were exported from the Apple mail app. Wish I could be of help.