[MlMt] Archiving local MailMate IMAP mailboxes using EagleFiler?

[Luís Trevisan]

Hi Henry,

I recently started using EagleFiler because my mailbox had grown too 
large — nearly 100 GB.

I’m not sure I followed the best approach, but I’m satisfied with 
the outcome. Still, the process took quite a while; I left my Mac 
running overnight for several nights to complete the imports. Getting 
straight to the point, here are the steps I followed:

1. I exported messages from MailMate as .eml files, grouped by year.

2. I made a full backup using Time Machine.

3. I imported the files into EagleFiler, one year at a time.

4. After each import, EagleFiler took about an hour to index the files, 
so I let the process run overnight while I slept. Tip: use `caffeinate 
-i` in the Terminal to prevent your Mac from sleeping.

5. I converted the .eml files into .mbox format to improve performance. 
This step might not be necessary if your export is already an .mbox. If 
not, inside EagleFiler go to Records > Merge Mailboxes/Message Files.

I hope this information helps.

Best regards,
Luís

On 1 Aug 2025, at 17:10, Henry Seiden wrote:

> Hello All,
>
> Is anyone having success with archiving IMAP folders with old email 
> using EagleFiler.
>
> I have unique situation where I have previous year files going back a 
> long way back (2010) that I would like incorporate with my current 
> email folder organization by year already organized in a specific 
> format (from folder to mbox to eml: Message Folder>mbox>eml). I 
> thought it would be  simple enough just as I thought EagleFiler(EF) 
> would do it easily. Alas, it seems neither is true for me.
>
> As nice as EF seems and flexible and well-supported, too, I have not 
> been able to get a clean import migration using my existing previously 
> migrated Mail.app data, the current MM already selected Archived 
> folders, MacOS 15.6. Would like to know how you may have accomplished 
> this task, what problems you ran into and overcame and if it has 
> worked out well for you.
>
> Respectfully,
>
> Henry Seiden
> - -
> Techworks Pro Co.
> E: info<at>techworkspro<dot>com
> W: http://techworkspro.com
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