diff --git a/install/vst-install-debian.sh b/install/vst-install-debian.sh
index 769ddfa6..4f7aa770 100644
--- a/install/vst-install-debian.sh
+++ b/install/vst-install-debian.sh
@@ -1079,6 +1079,7 @@ if [ "$dovecot" = 'yes' ]; then
     cp -rf $vestacp/dovecot /etc/
     cp -f $vestacp/logrotate/dovecot /etc/logrotate.d/
     chown -R root:root /etc/dovecot*
+    sed -i "s#namespace inbox {#namespace inbox {\n  inbox = yes#" /etc/dovecot/conf.d/15-mailboxes.conf
     update-rc.d dovecot defaults
     service dovecot start
     check_result $? "dovecot start failed"