diff --git a/data/Dockerfiles/dovecot/Dockerfile b/data/Dockerfiles/dovecot/Dockerfile
index 791f1349..4c95f929 100644
--- a/data/Dockerfiles/dovecot/Dockerfile
+++ b/data/Dockerfiles/dovecot/Dockerfile
@@ -102,6 +102,7 @@ RUN groupadd -g 5000 vmail \
 COPY trim_logs.sh /usr/local/bin/trim_logs.sh
 COPY clean_q_aged.sh /usr/local/bin/clean_q_aged.sh
 COPY syslog-ng.conf /etc/syslog-ng/syslog-ng.conf
+COPY syslog-ng-redis_slave.conf /etc/syslog-ng/syslog-ng-redis_slave.conf
 COPY imapsync /usr/local/bin/imapsync
 COPY postlogin.sh /usr/local/bin/postlogin.sh
 COPY imapsync_cron.pl /usr/local/bin/imapsync_cron.pl
diff --git a/data/Dockerfiles/dovecot/docker-entrypoint.sh b/data/Dockerfiles/dovecot/docker-entrypoint.sh
index b61bc840..41302b36 100755
--- a/data/Dockerfiles/dovecot/docker-entrypoint.sh
+++ b/data/Dockerfiles/dovecot/docker-entrypoint.sh
@@ -91,13 +91,13 @@ EOF
 echo -n ${ACL_ANYONE} > /etc/dovecot/acl_anyone
 
 if [[ "${SKIP_SOLR}" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
-echo -n 'quota acl zlib listescape mail_crypt mail_crypt_acl mail_log notify' > /etc/dovecot/mail_plugins
-echo -n 'quota imap_quota imap_acl acl zlib imap_zlib imap_sieve listescape mail_crypt mail_crypt_acl notify mail_log' > /etc/dovecot/mail_plugins_imap
-echo -n 'quota sieve acl zlib listescape mail_crypt mail_crypt_acl' > /etc/dovecot/mail_plugins_lmtp
+echo -n 'quota acl zlib listescape mail_crypt mail_crypt_acl mail_log notify replication' > /etc/dovecot/mail_plugins
+echo -n 'quota imap_quota imap_acl acl zlib imap_zlib imap_sieve listescape mail_crypt mail_crypt_acl notify replication mail_log' > /etc/dovecot/mail_plugins_imap
+echo -n 'quota sieve acl zlib listescape mail_crypt mail_crypt_acl notify replication' > /etc/dovecot/mail_plugins_lmtp
 else
-echo -n 'quota acl zlib listescape mail_crypt mail_crypt_acl mail_log notify fts fts_solr' > /etc/dovecot/mail_plugins
-echo -n 'quota imap_quota imap_acl acl zlib imap_zlib imap_sieve listescape mail_crypt mail_crypt_acl notify mail_log fts fts_solr' > /etc/dovecot/mail_plugins_imap
-echo -n 'quota sieve acl zlib listescape mail_crypt mail_crypt_acl fts fts_solr' > /etc/dovecot/mail_plugins_lmtp
+echo -n 'quota acl zlib listescape mail_crypt mail_crypt_acl mail_log notify fts fts_solr replication' > /etc/dovecot/mail_plugins
+echo -n 'quota imap_quota imap_acl acl zlib imap_zlib imap_sieve listescape mail_crypt mail_crypt_acl notify mail_log fts fts_solr replication' > /etc/dovecot/mail_plugins_imap
+echo -n 'quota sieve acl zlib listescape mail_crypt mail_crypt_acl fts fts_solr notify replication' > /etc/dovecot/mail_plugins_lmtp
 fi
 chmod 644 /etc/dovecot/mail_plugins /etc/dovecot/mail_plugins_imap /etc/dovecot/mail_plugins_lmtp /templates/quarantine.tpl
 
@@ -138,6 +138,10 @@ function auth_password_verify(req, pass)
   return dovecot.auth.PASSDB_RESULT_USER_UNKNOWN, "No such user"
 end
 
+function auth_passdb_lookup(req)
+   return dovecot.auth.PASSDB_RESULT_USER_UNKNOWN, ""
+end
+
 function script_init()
   mysql = require "luasql.mysql"
   env  = mysql.mysql()
@@ -185,7 +189,7 @@ done
 RAND_USER=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 16 | head -n 1)
 RAND_PASS=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 24 | head -n 1)
 
-echo ${RAND_USER}@mailcow.local:{SHA1}$(echo -n ${RAND_PASS} | sha1sum | awk '{print $1}') > /etc/dovecot/dovecot-master.passwd
+echo ${RAND_USER}@mailcow.local:{SHA1}$(echo -n ${RAND_PASS} | sha1sum | awk '{print $1}'):::::: > /etc/dovecot/dovecot-master.passwd
 echo ${RAND_USER}@mailcow.local::5000:5000:::: > /etc/dovecot/dovecot-master.userdb
 echo ${RAND_USER}@mailcow.local:${RAND_PASS} > /etc/sogo/sieve.creds
 
@@ -227,7 +231,7 @@ sed -i "s/__DBUSER__/${DBUSER}/g" /usr/local/bin/imapsync_cron.pl /usr/local/bin
 sed -i "s/__DBPASS__/${DBPASS}/g" /usr/local/bin/imapsync_cron.pl /usr/local/bin/quarantine_notify.py /usr/local/bin/clean_q_aged.sh /etc/dovecot/lua/app-passdb.lua
 sed -i "s/__DBNAME__/${DBNAME}/g" /usr/local/bin/imapsync_cron.pl /usr/local/bin/quarantine_notify.py /usr/local/bin/clean_q_aged.sh /etc/dovecot/lua/app-passdb.lua
 sed -i "s/__LOG_LINES__/${LOG_LINES}/g" /usr/local/bin/trim_logs.sh
-if [[ "${MASTER}" =~ ^([yY][eE][sS]|[yY])+$ ]]; then
+if [[ "${MASTER}" =~ ^([nN][oO]|[nN])+$ ]]; then
 # Toggling MASTER will result in a rebuild of containers, so the quota script will be recreated
 cat <<'EOF' > /usr/local/bin/quota_notify.py
 #!/usr/bin/python3
@@ -301,6 +305,8 @@ IMAPSYNC_TABLE=$(mysql --socket=/var/run/mysqld/mysqld.sock -u ${DBUSER} -p${DBP
 # Envsubst maildir_gc
 echo "$(envsubst < /usr/local/bin/maildir_gc.sh)" > /usr/local/bin/maildir_gc.sh
 
+# GUID generation
+# Will fail and restart until versions exists (ok)
 PUBKEY_MCRYPT=$(doveconf -P | grep -i mail_crypt_global_public_key | cut -d '<' -f2)
 if [ -f ${PUBKEY_MCRYPT} ]; then
   GUID=$(cat <(echo ${MAILCOW_HOSTNAME}) /mail_crypt/ecpubkey.pem | sha256sum | cut -d ' ' -f1 | tr -cd "[a-fA-F0-9.:/] ")
@@ -330,4 +336,8 @@ done
 # May be related to something inside Docker, I seriously don't know
 touch /etc/dovecot/lua/app-passdb.lua
 
+if [[ ! -z ${REDIS_SLAVEOF_IP} ]]; then
+  cp /etc/syslog-ng/syslog-ng-redis_slave.conf /etc/syslog-ng/syslog-ng.conf
+fi
+
 exec "$@"
diff --git a/data/Dockerfiles/dovecot/syslog-ng-redis_slave.conf b/data/Dockerfiles/dovecot/syslog-ng-redis_slave.conf
new file mode 100644
index 00000000..6b83e72a
--- /dev/null
+++ b/data/Dockerfiles/dovecot/syslog-ng-redis_slave.conf
@@ -0,0 +1,42 @@
+@version: 3.19
+@include "scl.conf"
+options {
+  chain_hostnames(off);
+  flush_lines(0);
+  use_dns(no);
+  use_fqdn(no);
+  owner("root"); group("adm"); perm(0640);
+  stats_freq(0);
+  bad_hostname("^gconfd$");
+};
+source s_src {
+  unix-stream("/dev/log");
+  internal();
+};
+destination d_stdout { pipe("/dev/stdout"); };
+destination d_redis_ui_log {
+  redis(
+    host("`REDIS_SLAVEOF_IP`")
+    persist-name("redis1")
+    port(`REDIS_SLAVEOF_PORT`)
+    command("LPUSH" "DOVECOT_MAILLOG" "$(format-json time=\"$S_UNIXTIME\" priority=\"$PRIORITY\" program=\"$PROGRAM\" message=\"$MESSAGE\")\n")
+  );
+};
+destination d_redis_f2b_channel {
+  redis(
+    host("`REDIS_SLAVEOF_IP`")
+    persist-name("redis2")
+    port(`REDIS_SLAVEOF_PORT`)
+    command("PUBLISH" "F2B_CHANNEL" "$MESSAGE")
+  );
+};
+filter f_mail { facility(mail); };
+filter f_replica { not match("User has no mail_replica in userdb" value("MESSAGE")); };
+log {
+  source(s_src);
+  filter(f_replica);
+  destination(d_stdout);
+  filter(f_mail);
+  destination(d_redis_ui_log);
+  destination(d_redis_f2b_channel);
+};
diff --git a/data/Dockerfiles/dovecot/syslog-ng.conf b/data/Dockerfiles/dovecot/syslog-ng.conf
index f63a0ee2..0ab19b6b 100644
--- a/data/Dockerfiles/dovecot/syslog-ng.conf
+++ b/data/Dockerfiles/dovecot/syslog-ng.conf
@@ -31,10 +31,10 @@ destination d_redis_f2b_channel {
   );
 };
 filter f_mail { facility(mail); };
-#filter f_not_watchdog { not message("172\.22\.1\.248"); };
+filter f_replica { not match("User has no mail_replica in userdb" value("MESSAGE")); };
 log {
   source(s_src);
-#  filter(f_not_watchdog);
+  filter(f_replica);
   destination(d_stdout);
   filter(f_mail);
   destination(d_redis_ui_log);
diff --git a/data/Dockerfiles/dovecot/trim_logs.sh b/data/Dockerfiles/dovecot/trim_logs.sh
index b916827e..86990226 100755
--- a/data/Dockerfiles/dovecot/trim_logs.sh
+++ b/data/Dockerfiles/dovecot/trim_logs.sh
@@ -7,12 +7,18 @@ catch_non_zero() {
     echo "Command ${CMD} failed to execute, exit code was ${EC}"
   fi
 }
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM ACME_LOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM POSTFIX_MAILLOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM DOVECOT_MAILLOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM SOGO_LOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM NETFILTER_LOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM AUTODISCOVER_LOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM API_LOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM RL_LOG 0 __LOG_LINES__"
-catch_non_zero "/usr/bin/redis-cli -h redis LTRIM WATCHDOG_LOG 0 __LOG_LINES__"
+# Do not attempt to write to slave
+if [[ ! -z ${REDIS_SLAVEOF_IP} ]]; then
+  REDIS_CMDLINE="redis-cli -h ${REDIS_SLAVEOF_IP} -p ${REDIS_SLAVEOF_PORT}"
+else
+  REDIS_CMDLINE="redis-cli -h redis -p 6379"
+fi
+catch_non_zero "${REDIS_CMDLINE} LTRIM ACME_LOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM POSTFIX_MAILLOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM DOVECOT_MAILLOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM SOGO_LOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM NETFILTER_LOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM AUTODISCOVER_LOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM API_LOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM RL_LOG 0 __LOG_LINES__"
+catch_non_zero "${REDIS_CMDLINE} LTRIM WATCHDOG_LOG 0 __LOG_LINES__"