This morning, it looks like it’s working. It took a long time to decompress the compressed mail folder.
You’re right, it shows up in imap as “2021.gz”.
Up to now, I was decompressing it if I needed it, this is great, saves me a step. I don’t need to modify it, just search it sometimes.
From: Aki Tuomi via dovecot
Sent: 15 June 2023 15:21
To: Michael Grant; Michael Grant via dovecot
Subject: Re: zlib compressed folders
> On 14/06/2023 14:28 EEST Michael Grant via dovecot <dovecot@dovecot.org> wrote:
>
>
> I’ve been playing with zlib compressed mail archives. I can’t seem to get it to work. I followed the instructions here:
>
> https://doc.dovecot.org/configuration_manual/zlib_plugin/
>
> I’m not interested in being able to save, just read-only would be great.
>
> I have some compressed mail archives, for example 2020.gz in my ~/mail/ directory. I have some uncompressed ones too like 2021. Both are mbox formatted. In my imap client, I see both 2020.gz and 2021 as imap folders. I can access mail in 2021 but not in 2020.gz. It just says it’s empty.
>
> My local.conf has this in it:
>
> mail_plugins = $mail_plugins zlib
>
> I know for sure this is being read because if I change this to some non-existent plugin, I see an in the log complaining about a non-existent plugin. I’ve tried also adding in the lines for saving but no difference.
>
> Would love to know if there’s something more I need to do. Also, should I expect to see a folder named 2020 instead of 2020.gz in my imap clients? My suspicion is that dovecot is treating these as uncompressed imap folders which it can’t read because they look like garbage. Is there some doveadm command to get it to re-scan folders that I need to run and then realize this is a folder using zlib?
>
> Michael Grant
I checked with latest main, and it seems that:
- it requires the folder to be accessed as "folder.gz"
- if it has any broken emails, then it will fail to read the folder.
So this feature is not really working great. I would suggest to decompress your folders as workaround.
Aki
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