Hello everyone!

Our archive namespace is kept in MBOX format with Maildir++ layout due to:

 * Need to have the email from all users/folders self contained (our
   base namespace uses MDBOX with single instance storage of attachments)
 * MBOX/FS layout isn't supported because some folders have messages
   and subfolders.

I'm trying to compress that namespace using zstd/gzip following the informations from Dovecot documentation about the zlib plugin but when the (MBOX/Maildir++) compress and become with .zst/.zstd/.gz suffix (both tested) the system can't read the mailboxes and incorrectly reports the suffix (.zstd/.gz) as a subfolder name (following the Maildir++ file structure).

Is there any way to make the MBOX/Maildir++ compatible with the zlib compression?

Using Dovecot 2.3.14 on Debian10

Regards.

--
Best regards,

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Pedro Ribeiro
Politécnico de Lisboa, Serviços da Presidência
Departamento de Sistemas de Informação e Comunicações
Phone:   +351 210 464 700 (general) / VoIP: 80100
Helpdesk: helpd...@net.ipl.pt / https://www.net.ipl.pt
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