diff --git a/src/main/java/de/srsoftware/widerhall/data/MailingList.java b/src/main/java/de/srsoftware/widerhall/data/MailingList.java
index ab093a2..f222baf 100644
--- a/src/main/java/de/srsoftware/widerhall/data/MailingList.java
+++ b/src/main/java/de/srsoftware/widerhall/data/MailingList.java
@@ -85,7 +85,7 @@ public class MailingList implements MessageHandler, ProblemListener {
      * @param state
      */
     public MailingList(String email, String name, String imapHost, int imapPort, String imapUser, String imapPass, String inbox, String smtpHost, int smtpPort, String smtpUser, String smtpPass, int state) {
-        this.email = email;
+        this.email = email.toLowerCase();
         this.name = name;
         this.state = state;
         this.smtp = new SmtpClient(smtpHost,smtpPort,smtpUser,smtpPass,email);
@@ -260,6 +260,7 @@ public class MailingList implements MessageHandler, ProblemListener {
      */
     public static MailingList load(String listEmail) {
         if (listEmail == null) return null;
+        listEmail = listEmail.toLowerCase();
         var ml = cache.get(listEmail);
         try {
             var rs = Database.open()
diff --git a/src/main/java/de/srsoftware/widerhall/data/User.java b/src/main/java/de/srsoftware/widerhall/data/User.java
index c66f54d..a531b81 100644
--- a/src/main/java/de/srsoftware/widerhall/data/User.java
+++ b/src/main/java/de/srsoftware/widerhall/data/User.java
@@ -34,7 +34,7 @@ public class User {
      * @param permissions
      */
     public User(String email, String name, String salt, String hashedPass, int permissions) {
-        this.email = email;
+        this.email = email.toLowerCase();
         this.name = name;
         this.salt = salt;
         this.hashedPass = hashedPass;
@@ -91,6 +91,7 @@ public class User {
      * @throws SQLException
      */
     public static User create(String email, String name, String password) throws SQLException {
+        email = email.toLowerCase();
         String salt = null;
         String hashedPass = null;
         if (password != null) {
@@ -139,7 +140,7 @@ public class User {
     }
 
     public static User load(String email) throws SQLException {
-        var rs = Database.open().select(TABLE_NAME).where(EMAIL,email).compile().exec();
+        var rs = Database.open().select(TABLE_NAME).where(EMAIL,email.toLowerCase()).compile().exec();
         try {
             if (rs.next()) {
                 return User.from(rs);
@@ -208,7 +209,7 @@ public class User {
     public static User loadUser(String email, String password) throws InvalidKeyException, SQLException {
         ResultSet rs = Database.open()
                 .select(TABLE_NAME)
-                .where(EMAIL,email)
+                .where(EMAIL,email.toLowerCase())
                 .compile()
                 .exec();
         try {