Merge branch 'nightly' into feature/sso

data/conf/dovecot/dovecot.conf

@@ -24,6 +24,11 @@ mail_plugins = </etc/dovecot/mail_plugins
 mail_attachment_fs = crypt:set_prefix=mail_crypt_global:posix:
 mail_attachment_dir = /var/attachments
 mail_attachment_min_size = 128k
+# Significantly speeds up very large mailboxes, but is only safe to enable if
+# you do not manually modify the files in the `cur` directories in
+# mailcowdockerized_vmail-vol-1.
+# https://docs.mailcow.email/manual-guides/Dovecot/u_e-dovecot-performance/
+maildir_very_dirty_syncs = yes
 
 # Dovecot 2.2
 #ssl_protocols = !SSLv3
@@ -236,8 +241,8 @@ plugin {
   mail_crypt_global_public_key = </mail_crypt/ecpubkey.pem
   mail_crypt_save_version = 2
 
-  # Enable compression while saving, lz4 Dovecot v2.2.11+
-  zlib_save = lz4
+  # Enable compression while saving, zstd Dovecot v2.3.17+
+  zlib_save = zstd
 
   mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
   mail_log_fields = uid box msgid size