diff --git a/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/CredentialsAlertService.java b/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/CredentialsAlertService.java
index 03d68b4b55fc09787295e065fb2e5e365afe90b6..bf3ec4e8553713609cd648e54e76cec3aea1da8f 100644
--- a/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/CredentialsAlertService.java
+++ b/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/CredentialsAlertService.java
@@ -29,6 +29,8 @@ import eu.europa.ec.edelivery.smp.data.model.user.DBUser;
 import eu.europa.ec.edelivery.smp.data.ui.enums.AlertLevelEnum;
 import eu.europa.ec.edelivery.smp.data.ui.enums.AlertStatusEnum;
 import eu.europa.ec.edelivery.smp.data.ui.enums.AlertTypeEnum;
+import eu.europa.ec.edelivery.smp.exceptions.ErrorCode;
+import eu.europa.ec.edelivery.smp.exceptions.SMPRuntimeException;
 import eu.europa.ec.edelivery.smp.logging.SMPLogger;
 import eu.europa.ec.edelivery.smp.logging.SMPLoggerFactory;
 import eu.europa.ec.edelivery.smp.services.mail.MailDataModel;
@@ -165,7 +167,7 @@ public class CredentialsAlertService {
 
     public void alertCredentialVerificationFailed(DBCredential credential) {
         LOG.info("Alert on Login failure [{}]!", credential);
-        Boolean loginFailureEnabled = configurationService.getAlertUserLoginFailureEnabled();
+        boolean loginFailureEnabled = configurationService.getAlertUserLoginFailureEnabled();
         if (!loginFailureEnabled) {
             LOG.warn("Alert Login failure is disabled!");
             return;
@@ -196,7 +198,7 @@ public class CredentialsAlertService {
 
     public void alertCredentialsSuspended(DBCredential credential) {
 
-        Boolean suspensionAlertEnabled = configurationService.getAlertUserSuspendedEnabled();
+        boolean suspensionAlertEnabled = configurationService.getAlertUserSuspendedEnabled();
         if (!suspensionAlertEnabled) {
             LOG.info("Alert suspended is disabled!");
             return;
@@ -384,7 +386,7 @@ public class CredentialsAlertService {
                 resetUrl = smpUrlBuilder.buildSMPUriForApplication().toURL();
                 LOG.warn("Reset URL is not set! Use default SMP URL [{}]", resetUrl);
             } catch (MalformedURLException e) {
-                throw new RuntimeException(e);
+                throw new SMPRuntimeException(ErrorCode.INTERNAL_ERROR, e);
             }
         }
         String resetUrlPath = StringUtils.appendIfMissing(resetUrl.toString(), "/", "/") + "ui/#/reset-credential/" + token;
@@ -489,6 +491,7 @@ public class CredentialsAlertService {
         } catch (Throwable exc) {
             LOG.error("Can not send mail [{}] for alert [{}]! Error [{}]",
                     mailTo, alert, ExceptionUtils.getRootCauseMessage(exc));
+            LOG.error("Error sending mail", exc);
             updateAlertStatus(alert, AlertStatusEnum.FAILED, ExceptionUtils.getRootCauseMessage(exc));
         }
 
diff --git a/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/mail/MailDataModel.java b/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/mail/MailDataModel.java
index 1d0bf7b550e1d20a4a98143f658413d84aa7bf80..d0ee71f9403e259cf75cf0840b90e2862501e605 100644
--- a/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/mail/MailDataModel.java
+++ b/smp-server-library/src/main/java/eu/europa/ec/edelivery/smp/services/mail/MailDataModel.java
@@ -20,11 +20,13 @@ package eu.europa.ec.edelivery.smp.services.mail;
 
 import eu.europa.ec.edelivery.smp.data.model.DBAlert;
 import eu.europa.ec.edelivery.smp.data.ui.enums.AlertTypeEnum;
+import org.apache.commons.lang3.StringUtils;
 
 import java.util.HashMap;
 import java.util.Map;
 
 public class MailDataModel {
+    private static final String DEFAULT_LANGUAGE = "en";
     public enum CommonProperties {
         CURRENT_DATETIME,
         SMP_INSTANCE_NAME,
@@ -46,8 +48,12 @@ public class MailDataModel {
         alert.getProperties().forEach((key, prop) ->  this.model.put(key, prop.getValue()));
     }
 
+    /**
+     * Get language of the mail. If not set, default language "en" is used.
+     * @return language of the mail or "en" if not set
+     */
     public String getLanguage() {
-        return language;
+        return StringUtils.isBlank(language)?DEFAULT_LANGUAGE:language;
     }
 
     public AlertTypeEnum getMailType() {
diff --git a/smp-server-library/src/test/resources/logback-test.xml b/smp-server-library/src/test/resources/logback-test.xml
index 5cd2715f6df215c4f8349ca80fc4a12666516e80..8c921c57b6acfa7c4b508c58e8cae212f2f25c82 100644
--- a/smp-server-library/src/test/resources/logback-test.xml
+++ b/smp-server-library/src/test/resources/logback-test.xml
@@ -25,7 +25,7 @@
     <property name="consolePattern" value="%d{ISO8601} [%X{smp_user}] [%X{smp_session_id}] [%X{smp_request_id}] [%thread] %5p %c{1}:%L - %m%n" scope="global"/>
 
      <appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
-        <file>${buildDirectory}/logs/edelivery-smp.log</file>
+        <file>target/logs/edelivery-smp.log</file>
         <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
             <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
                 <marker>SECURITY</marker>
@@ -36,7 +36,7 @@
         </filter>
         <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
             <!-- rollover daily -->
-            <fileNamePattern>${buildDirectory}/logs/edelivery-smp-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
+            <fileNamePattern>target/logs/edelivery-smp-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
             <!-- each file should be at most 30MB, keep 60 days worth of history, but at most 20GB -->
             <maxFileSize>30MB</maxFileSize>
             <maxHistory>60</maxHistory>