diff --git a/hsarback/src/de/hsadmin/core/qserv/SmtpHelper.java b/hsarback/src/de/hsadmin/core/qserv/SmtpHelper.java
index 83ba6c3..f363334 100644
--- a/hsarback/src/de/hsadmin/core/qserv/SmtpHelper.java
+++ b/hsarback/src/de/hsadmin/core/qserv/SmtpHelper.java
@@ -27,6 +27,9 @@ public class SmtpHelper {
 			SMTPClient client = new SMTPClient();
 			String canonicalHostName = InetAddress.getLocalHost().getHostName();
 			String smtpHost = Config.getInstance().getProperty("smtp.host");
+			if (smtpHost == null || smtpHost.trim().isEmpty()) {
+				smtpHost = "localhost";
+			}
 			if ("unittest".equals(smtpHost)) { // Nur fuer Unit-Tests
 				if (subject.toLowerCase().contains("error")) {
 					throw new HSAdminException("Konnte Mail nicht senden");