diff --git a/package/secubox/secubox-app-mailserver/files/usr/sbin/mailserverctl b/package/secubox/secubox-app-mailserver/files/usr/sbin/mailserverctl
index 93457f67..77965444 100644
--- a/package/secubox/secubox-app-mailserver/files/usr/sbin/mailserverctl
+++ b/package/secubox/secubox-app-mailserver/files/usr/sbin/mailserverctl
@@ -85,6 +85,9 @@ mkdir -p /run/dovecot
 chown -R dovecot:dovecot /run/dovecot
 chmod 755 /run/dovecot
 
+# Ensure dovecot users file is readable (fixes LMTP lookup errors)
+[ -f /etc/dovecot/users ] && chmod 644 /etc/dovecot/users && chown root:dovecot /etc/dovecot/users
+
 # Start services
 /usr/sbin/rsyslogd
 sleep 1