Some people have been asking this forever, but because it wasn't
possible to implement it as a plugin, I hadn't done it. Now, due to some
API changes for other purposes, it was suddenly easy.
So, if you want to try it, grab the latest CVS code / nightly CVS
snapshot and http://dovecot.org/patches/1.0/zlib-plugin.tar.gz
Compilation instructions inside zlib-plugin.c file.
What it does is check if mbox name ends with ".gz", if so it opens it
as
read-only using zlib. If the file isn't actually zlib compressed, zlib
seems to be able to still access it as a normal file (but it's still
read-only).
It should be possible to implement it for maildir files as well by
hooking into mail_get_stream().
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