diff --git a/app/Gulag.py b/app/Gulag.py
index fe2a86e..82d9174 100644
--- a/app/Gulag.py
+++ b/app/Gulag.py
@@ -353,6 +353,24 @@ class Gulag:
       logging.warning(whoami(self) + e.message)
       raise GulagException(whoami(self) + e.message) from e
 
+  def modify_quarmail(self, quarmail):
+    try:
+      if 'id' not in quarmail:
+        raise GulagBadInputException(whoami(self) + "'id' is mandatory!")
+      for field in quarmail:
+        if field not in self.fields['QuarMails']:
+          raise GulagBadInputException(whoami(self) +
+            "Unknown QuarMail field: " + field
+          )
+      self.db.modify_quarmail(quarmail)
+    except GulagDBBadInputException as e:
+      raise GulagBadInputException(whoami(self) + e.message) from e
+    except GulagDBNotFoundException as e:
+      raise GulagNotFoundException(whoami(self) + e.message) from e
+    except GulagDBException as e:
+      logging.warning(whoami(self) + e.message)
+      raise GulagException(whoami(self) + e.message) from e
+
   def delete_quarmail(self, args):
     qm_db = None
     try:
diff --git a/app/GulagDB.py b/app/GulagDB.py
index 61d9e01..f61a33f 100644
--- a/app/GulagDB.py
+++ b/app/GulagDB.py
@@ -278,10 +278,37 @@ class GulagDB:
     except mariadb.Error as e:
       raise GulagDBException(whoami(self) + (e.msg)) from e
 
+  def modify_quarmail(self, quarmail):
+    try:
+      cursor = self.conn.cursor()
+      mod_fields = ""
+      if 'id' not in quarmail:
+        raise GulagDBBadInputException("Missing QuarMail-ID!")
+      if len(quarmail) < 2:
+        raise GulagDBBadInputException("No fields specified to modify!")
+      for field in quarmail:
+        if field == 'id':
+          continue
+        mod_fields += " " + field + "='" + quarmail[field] + "',"
+      mod_fields = str(mod_fields).rstrip(',')
+      cursor.execute(
+        "update QuarMails set "+mod_fields+" where id="+str(quarmail['id'])
+      )
+      if(cursor.rowcount == 0):
+        raise GulagDBNotFoundException(whoami(self) + "No QuarMails modified!")
+      cursor.close()
+      return True
+    except GulagDBBadInputException as e:
+      raise GulagDBBadInputException(whoami(self) + e.message) from e
+    except mariadb.Error as e:
+      raise GulagDBException(whoami(self) + str(e.msg)) from e
+
   def delete_quarmail(self, id):
     try:
       cursor = self.conn.cursor()
       cursor.execute("delete from QuarMails where id=" + str(id))
+      if(cursor.rowcount == 0):
+        raise GulagDBNotFoundException(whoami(self) + "No QuarMails deleted!")
       cursor.close()
       return True
     except mariadb.Error as e:
diff --git a/app/Resources.py b/app/Resources.py
index ecd695a..3036068 100644
--- a/app/Resources.py
+++ b/app/Resources.py
@@ -4,6 +4,7 @@ import json
 from Gulag import (
   GulagException,GulagNotFoundException,GulagBadInputException
 )
+from GulagUtils import whoami
 
 class GulagResource(Resource):
   gulag = None
@@ -39,7 +40,7 @@ class ResMailboxes(GulagResource):
     try:
       return self.gulag.get_mailboxes()
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResMailbox(GulagResource):
   def get(self,id):
@@ -56,9 +57,9 @@ class ResQuarMails(GulagResource):
     try:
       return self.gulag.get_quarmails(args)
     except GulagBadInputException as e:
-      abort(400, message=e.message)
+      abort(400, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMail(GulagResource):
   def get(self,quarmail_id):
@@ -68,20 +69,33 @@ class ResQuarMail(GulagResource):
         args['rfc822_message'] = True
       return self.gulag.get_quarmail(args)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
-    def delete(self,quarmail_id):
-      pass
+      abort(500, message=whoami(self)+e.message)
+  def patch(self,quarmail_id):
+    try:
+      args = json.loads(request.get_data(as_text=True))
+      args['id'] = quarmail_id
+    except json.JSONDecodeError as e:
+      abort(400, message=whoami(self) + "Invalid JSON: " + e.msg)
+    try:
+      self.gulag.modify_quarmail(args)
+      return Response(response=None,status=204,mimetype=None)
+    except GulagBadInputException as e:
+      abort(400, message=whoami(self)+e.message)
+    except GulagNotFoundException as e:
+      abort(404, message=whoami(self)+e.message)
+    except GulagException as e:
+      abort(500, message=whoami(self)+e.message)
   def delete(self,quarmail_id):
     args = {"quarmail_id": quarmail_id}
     try:
       self.gulag.delete_quarmail(args)
       return Response(response=None,status=202,mimetype=None)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMailRelease(GulagResource):
   def get(self,quarmail_id):
@@ -91,9 +105,9 @@ class ResQuarMailRelease(GulagResource):
     try:
       return self.gulag.release_quarmail(args)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMailBounce(GulagResource):
   def get(self,quarmail_id):
@@ -103,9 +117,9 @@ class ResQuarMailBounce(GulagResource):
     try:
       return self.gulag.bounce_quarmail(args)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMailAttachments(GulagResource):
   def get(self,quarmail_id):
@@ -115,7 +129,7 @@ class ResQuarMailAttachments(GulagResource):
     try:
       return self.gulag.get_quarmail_attachments(args)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMailAttachment(GulagResource):
   def get(self,quarmail_id,attachment_id):
@@ -128,9 +142,9 @@ class ResQuarMailAttachment(GulagResource):
     try:
       return self.gulag.get_quarmail_attachment(args)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMailURIs(GulagResource):
   def get(self,quarmail_id):
@@ -142,7 +156,7 @@ class ResQuarMailURIs(GulagResource):
     try:
       return self.gulag.get_quarmail_uris(args)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResQuarMailURI(GulagResource):
   def get(self,quarmail_id,uri_id):
@@ -153,9 +167,9 @@ class ResQuarMailURI(GulagResource):
     try:
       return self.gulag.get_quarmail_uri(args)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResAttachments(GulagResource):
   def get(self):
@@ -167,9 +181,9 @@ class ResAttachment(GulagResource):
     try:
       return self.gulag.get_attachment(args)
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResRspamd2Mailbox(GulagResource):
   def post(self,mailbox_id):
@@ -181,11 +195,11 @@ class ResRspamd2Mailbox(GulagResource):
       })
       return {}
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagBadInputException as e:
-      abort(400, message=e.message)
+      abort(400, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
 
 class ResMailradar2Mailbox(GulagResource):
   def post(self,mailbox_id):
@@ -197,8 +211,8 @@ class ResMailradar2Mailbox(GulagResource):
       })
       return {}
     except GulagNotFoundException as e:
-      abort(404, message=e.message)
+      abort(404, message=whoami(self)+e.message)
     except GulagBadInputException as e:
-      abort(400, message=e.message)
+      abort(400, message=whoami(self)+e.message)
     except GulagException as e:
-      abort(500, message=e.message)
+      abort(500, message=whoami(self)+e.message)
diff --git a/docker/gulag-db/debian/Dockerfile b/docker/gulag-db/debian/Dockerfile
index 8c89103..4480c5f 100644
--- a/docker/gulag-db/debian/Dockerfile
+++ b/docker/gulag-db/debian/Dockerfile
@@ -2,6 +2,9 @@ ARG http_proxy
 ARG https_proxy
 FROM debian
 RUN apt update && \
-  apt -yq --no-install-recommends install procps net-tools mariadb-server mariadb-client
+  apt -yq --no-install-recommends install procps net-tools \
+    mariadb-server mariadb-client \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
 COPY db/gulag.sql /.
 CMD ["/usr/bin/mysqld_safe"]
diff --git a/docker/gulag-server/debian/Dockerfile b/docker/gulag-server/debian/Dockerfile
index 762673f..0b4dcb6 100644
--- a/docker/gulag-server/debian/Dockerfile
+++ b/docker/gulag-server/debian/Dockerfile
@@ -14,7 +14,9 @@ RUN env; set -ex ; \
       uwsgi uwsgi-plugin-python3 procps net-tools \
       python3-pip libmagic1 python3-ssdeep \
  && pip3 install python-magic \
- && /bin/mkdir /config /socket /app
+ && /bin/mkdir /config /socket /app \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
 
 COPY app/*.py /app/
 
diff --git a/gulag-openapi-2.0.yaml b/gulag-openapi-2.0.yaml
index 27f03c6..c90f86a 100644
--- a/gulag-openapi-2.0.yaml
+++ b/gulag-openapi-2.0.yaml
@@ -103,6 +103,29 @@ paths:
           description: not found
         500:
           description: server error
+    patch:
+      summary: modifies a quarantined email
+      operationId: modify_quarmail
+      produces:
+      - application/json
+      parameters:
+      - in: path
+        name: quarmail_id
+        description: unique id of quarantined email
+        required: true
+        type: integer
+      - in: body
+        name: quarmail
+        description: quarmail fields to modify.
+          schema:
+            $ref: "#/definitions/QuarMail"
+      responses:
+        202:
+          description: quarantined email deleted
+        404:
+          description: not found
+        500:
+          description: server error
     delete:
       summary: deletes a quarantined email
       operationId: delete_quarmail
@@ -121,7 +144,6 @@ paths:
           description: not found
         500:
           description: server error
-
   /quarmails/{quarmail_id}/attachments:
     get:
       summary: retrieves meta data of all attachments of a quarantined email by quarmail_id