diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java
new file mode 100644
index 0000000..af029cf
--- /dev/null
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java
@@ -0,0 +1,7 @@
+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class EmailExistsException extends Exception{
+    public EmailExistsException(String message) {
+        super(message);
+    }
+}
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java
new file mode 100644
index 0000000..e11d824
--- /dev/null
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java
@@ -0,0 +1,7 @@
+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class EmailNotFoundException extends Exception{
+    public EmailNotFoundException(String message) {
+        super(message);
+    }
+}
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java
new file mode 100644
index 0000000..1ee6c81
--- /dev/null
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java
@@ -0,0 +1,7 @@
+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class UserNotFoundException extends Exception{
+    public UserNotFoundException(String message) {
+        super(message);
+    }
+}
diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java
new file mode 100644
index 0000000..bc34262
--- /dev/null
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java
@@ -0,0 +1,7 @@
+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class UsernameExistsException extends Exception{
+    public UsernameExistsException(String message) {
+        super(message);
+    }
+}