diff --git a/api/messageservice.yaml b/api/messageservice.yaml
index 1b01415..5595399 100644
--- a/api/messageservice.yaml
+++ b/api/messageservice.yaml
@@ -405,6 +405,43 @@ paths:
           description: INTERNAL SERVER ERROR - server encountered unexpected condition
       security:
         - Bearer: [ ]
+  /messages/aliasWithContent/new:
+    post:
+      tags:
+        - message-controller
+      summary: 'Saves a new system message containing the provided message type in the alias and
+      some content.
+      [Authorization: Role: user, consultant, technical]'
+      operationId: saveAliasMessageWithContent
+      parameters:
+        - name: rcGroupId
+          in: header
+          required: true
+          schema:
+            type: string
+      requestBody:
+        required: true
+        content:
+          'application/json':
+            schema:
+              $ref: '#/components/schemas/AliasMessageDTO'
+      responses:
+        201:
+          description: CREATED - message was successfully created
+          content:
+            'application/json':
+              schema:
+                $ref: '#/components/schemas/MessageResponseDTO'
+        400:
+          description: BAD REQUEST - invalid/incomplete request or body object
+        401:
+          description: UNAUTHORIZED - no/invalid Keycloak token
+        403:
+          description: FORBIDDEN - no/invalid role/authorization
+        500:
+          description: INTERNAL SERVER ERROR - server encountered unexpected condition
+      security:
+        - Bearer: [ ]
 
 components:
   schemas:
@@ -538,6 +575,8 @@ components:
           $ref: '#/components/schemas/VideoCallMessageDTO'
         messageType:
           $ref: '#/components/schemas/MessageType'
+        content:
+          type: string
 
     ForwardMessageDTO:
       type: object
@@ -601,6 +640,9 @@ components:
     MessageType:
       type: string
       enum:
+        - "APPOINTMENT_SET"
+        - "APPOINTMENT_CANCELLED"
+        - "APPOINTMENT_RESCHEDULED"
         - "FINISHED_CONVERSATION"
         - "FORWARD"
         - "FURTHER_STEPS"
diff --git a/src/main/java/de/caritas/cob/messageservice/Messenger.java b/src/main/java/de/caritas/cob/messageservice/Messenger.java
index 61aac04..526d79c 100644
--- a/src/main/java/de/caritas/cob/messageservice/Messenger.java
+++ b/src/main/java/de/caritas/cob/messageservice/Messenger.java
@@ -212,4 +212,19 @@ public boolean patchEventMessage(String rcToken, String rcUserId, String message
 
     return isUpdated;
   }
+
+  /**
+   * Posts a message which contains an alias with the provided {@link MessageType} in
+   * the specified Rocket.Chat group.
+   *
+   * @param rcGroupId   Rocket.Chat group ID
+   * @param messageType {@link MessageType}
+   * @return {@link MessageResponseDTO}
+   */
+  public MessageResponseDTO postAliasMessage(String rcGroupId, MessageType messageType, String content) {
+    AliasMessageDTO aliasMessageDTO = new AliasMessageDTO().messageType(messageType).content(content);
+    var response = this.rocketChatService.postAliasOnlyMessageAsSystemUser(rcGroupId,
+        aliasMessageDTO);
+    return mapper.messageResponseOf(response);
+  }
 }
diff --git a/src/main/java/de/caritas/cob/messageservice/api/controller/MessageController.java b/src/main/java/de/caritas/cob/messageservice/api/controller/MessageController.java
index 8c62a3c..53e5952 100644
--- a/src/main/java/de/caritas/cob/messageservice/api/controller/MessageController.java
+++ b/src/main/java/de/caritas/cob/messageservice/api/controller/MessageController.java
@@ -271,4 +271,25 @@ public ResponseEntity<Void> patchMessage(String rcToken, String rcUserId, String
         ? ResponseEntity.noContent().build()
         : ResponseEntity.notFound().build();
   }
+
+  /**
+   * Posts a message which contains an alias with the provided {@link MessageType} in the specified
+   * Rocket.Chat group.
+   *
+   * @param rcGroupId           (required) Rocket.Chat group ID
+   * @param aliasOnlyMessageDTO {@link AliasOnlyMessageDTO}
+   * @return {@link ResponseEntity} with the {@link HttpStatus}
+   */
+  @Override
+  public ResponseEntity<MessageResponseDTO> saveAliasMessageWithContent(
+      @RequestHeader String rcGroupId,
+      @Valid AliasMessageDTO aliasOnlyMessageDTO) {
+    var type = aliasOnlyMessageDTO.getMessageType();
+    var response = messenger
+        .postAliasMessage(rcGroupId, type, aliasOnlyMessageDTO.getContent());
+    return new ResponseEntity<>(response, HttpStatus.CREATED);
+  }
+
 }
+
+
diff --git a/src/main/java/de/caritas/cob/messageservice/api/service/RocketChatService.java b/src/main/java/de/caritas/cob/messageservice/api/service/RocketChatService.java
index bfdb0c0..88cc4f9 100644
--- a/src/main/java/de/caritas/cob/messageservice/api/service/RocketChatService.java
+++ b/src/main/java/de/caritas/cob/messageservice/api/service/RocketChatService.java
@@ -182,7 +182,7 @@ private void setMessageType(MessagesDTO msg) {
 
     if (nonNull(msg.getAlias().getForwardMessageDTO())) {
       msg.getAlias().setMessageType(MessageType.FORWARD);
-    } else {
+    } else if (nonNull(msg.getAlias().getVideoCallMessageDTO())) {
       msg.getAlias().setMessageType(MessageType.VIDEOCALL);
     }
   }
diff --git a/src/main/java/de/caritas/cob/messageservice/config/SecurityConfig.java b/src/main/java/de/caritas/cob/messageservice/config/SecurityConfig.java
index ab8fa1a..f10d270 100644
--- a/src/main/java/de/caritas/cob/messageservice/config/SecurityConfig.java
+++ b/src/main/java/de/caritas/cob/messageservice/config/SecurityConfig.java
@@ -81,6 +81,8 @@ protected void configure(HttpSecurity http) throws Exception {
         .hasAuthority(USE_FEEDBACK)
         .antMatchers("/messages/aliasonly/new")
         .hasAnyAuthority(USER_DEFAULT, CONSULTANT_DEFAULT, TECHNICAL_DEFAULT)
+        .antMatchers("/messages/aliasWithContent/new")
+        .hasAnyAuthority(USER_DEFAULT, CONSULTANT_DEFAULT, TECHNICAL_DEFAULT)
         .anyRequest()
         .denyAll();
   }