diff --git a/backend/src/middleware/helpers/cleanHtml.js b/backend/src/middleware/helpers/cleanHtml.js
new file mode 100644
index 000000000..c665dc8de
--- /dev/null
+++ b/backend/src/middleware/helpers/cleanHtml.js
@@ -0,0 +1,86 @@
+import sanitizeHtml from 'sanitize-html'
+import linkifyHtml from 'linkifyjs/html'
+
+const standardSanitizeHtmlOptions = {
+  allowedTags: [
+    'img',
+    'p',
+    'h3',
+    'h4',
+    'br',
+    'hr',
+    'b',
+    'i',
+    'u',
+    'em',
+    'strong',
+    'a',
+    'pre',
+    'ul',
+    'li',
+    'ol',
+    's',
+    'strike',
+    'span',
+    'blockquote',
+  ],
+  allowedAttributes: {
+    a: ['href', 'class', 'target', 'data-*', 'contenteditable'],
+    span: ['contenteditable', 'class', 'data-*'],
+    img: ['src'],
+  },
+  allowedIframeHostnames: ['www.youtube.com', 'player.vimeo.com'],
+  parser: {
+    lowerCaseTags: true,
+  },
+  transformTags: {
+    h1: 'h3',
+    h2: 'h3',
+    h3: 'h3',
+    h4: 'h4',
+    h5: 'strong',
+    i: 'em',
+    a: (tagName, attribs) => {
+      return {
+        tagName: 'a',
+        attribs: {
+          ...attribs,
+          href: attribs.href || '',
+          target: '_blank',
+          rel: 'noopener noreferrer nofollow',
+        },
+      }
+    },
+    b: 'strong',
+    s: 'strike',
+  },
+}
+
+export function cleanHtml(dirty, sanitizeHtmlOptions = standardSanitizeHtmlOptions) {
+  if (!dirty) {
+    return dirty
+  }
+
+  dirty = linkifyHtml(dirty)
+  dirty = sanitizeHtml(dirty, sanitizeHtmlOptions)
+
+  // remove empty html tags and duplicated linebreaks and returns
+  dirty = dirty
+    // remove all tags with "space only"
+    .replace(/<[a-z-]+>[\s]+<\/[a-z-]+>/gim, '')
+    .replace(/[\n]{3,}/gim, '\n\n')
+    .replace(/(\r\n|\n\r|\r|\n)/g, '<br>$1')
+
+    // replace all p tags with line breaks (and spaces) only by single linebreaks
+    // limit linebreaks to max 2 (equivalent to html "br" linebreak)
+    .replace(/(<br ?\/?>\s*){2,}/gim, '<br>')
+    // remove additional linebreaks after p tags
+    .replace(/<\/(p|div|th|tr)>\s*(<br ?\/?>\s*)+\s*<(p|div|th|tr)>/gim, '</p><p>')
+    // remove additional linebreaks inside p tags
+    .replace(/<[a-z-]+>(<[a-z-]+>)*\s*(<br ?\/?>\s*)+\s*(<\/[a-z-]+>)*<\/[a-z-]+>/gim, '')
+    // remove additional linebreaks when first child inside p tags
+    .replace(/<p>(\s*<br ?\/?>\s*)+/gim, '<p>')
+    // remove additional linebreaks when last child inside p tags
+    .replace(/(\s*<br ?\/?>\s*)+<\/p+>/gim, '</p>')
+  return dirty
+}
diff --git a/backend/src/middleware/helpers/email/sendMail.js b/backend/src/middleware/helpers/email/sendMail.js
index a25938a14..44c925482 100644
--- a/backend/src/middleware/helpers/email/sendMail.js
+++ b/backend/src/middleware/helpers/email/sendMail.js
@@ -1,4 +1,5 @@
 import CONFIG from '../../../config'
+import { cleanHtml } from '../../../middleware/helpers/cleanHtml.js'
 import nodemailer from 'nodemailer'
 import { htmlToText } from 'nodemailer-html-to-text'
 
@@ -10,6 +11,27 @@ if (!hasEmailConfig) {
   if (!CONFIG.TEST) {
     // eslint-disable-next-line no-console
     console.log('Warning: Middlewares will not try to send mails.')
+    // TODO: disable e-mail logging on database seeding?
+    // TODO: implement general logging like 'log4js', see Gradido project: https://github.com/gradido/gradido/blob/master/backend/log4js-config.json
+    sendMailCallback = async (templateArgs) => {
+      // eslint-disable-next-line no-console
+      console.log('--- Send E-Mail ---')
+      // eslint-disable-next-line no-console
+      console.log('To: ' + templateArgs.to)
+      // eslint-disable-next-line no-console
+      console.log('From: ' + templateArgs.from)
+      // eslint-disable-next-line no-console
+      console.log('Subject: ' + templateArgs.subject)
+      // eslint-disable-next-line no-console
+      console.log('Content:')
+      // eslint-disable-next-line no-console
+      console.log(
+        cleanHtml(templateArgs.html, {
+          allowedTags: ['a'],
+          allowedAttributes: { a: ['href'] },
+        }).replace(/&amp;/g, '&'),
+      )
+    }
   }
 } else {
   sendMailCallback = async (templateArgs) => {
diff --git a/backend/src/middleware/xssMiddleware.js b/backend/src/middleware/xssMiddleware.js
index 1292abb67..9c528b589 100644
--- a/backend/src/middleware/xssMiddleware.js
+++ b/backend/src/middleware/xssMiddleware.js
@@ -1,100 +1,15 @@
 import walkRecursive from '../helpers/walkRecursive'
-// import { getByDot, setByDot, getItems, replaceItems } from 'feathers-hooks-common'
-import sanitizeHtml from 'sanitize-html'
-// import { isEmpty, intersection } from 'lodash'
-import linkifyHtml from 'linkifyjs/html'
-
-function clean(dirty) {
-  if (!dirty) {
-    return dirty
-  }
-
-  dirty = linkifyHtml(dirty)
-  dirty = sanitizeHtml(dirty, {
-    allowedTags: [
-      'img',
-      'p',
-      'h3',
-      'h4',
-      'br',
-      'hr',
-      'b',
-      'i',
-      'u',
-      'em',
-      'strong',
-      'a',
-      'pre',
-      'ul',
-      'li',
-      'ol',
-      's',
-      'strike',
-      'span',
-      'blockquote',
-    ],
-    allowedAttributes: {
-      a: ['href', 'class', 'target', 'data-*', 'contenteditable'],
-      span: ['contenteditable', 'class', 'data-*'],
-      img: ['src'],
-    },
-    allowedIframeHostnames: ['www.youtube.com', 'player.vimeo.com'],
-    parser: {
-      lowerCaseTags: true,
-    },
-    transformTags: {
-      h1: 'h3',
-      h2: 'h3',
-      h3: 'h3',
-      h4: 'h4',
-      h5: 'strong',
-      i: 'em',
-      a: (tagName, attribs) => {
-        return {
-          tagName: 'a',
-          attribs: {
-            ...attribs,
-            href: attribs.href || '',
-            target: '_blank',
-            rel: 'noopener noreferrer nofollow',
-          },
-        }
-      },
-      b: 'strong',
-      s: 'strike',
-    },
-  })
-
-  // remove empty html tags and duplicated linebreaks and returns
-  dirty = dirty
-    // remove all tags with "space only"
-    .replace(/<[a-z-]+>[\s]+<\/[a-z-]+>/gim, '')
-    .replace(/[\n]{3,}/gim, '\n\n')
-    .replace(/(\r\n|\n\r|\r|\n)/g, '<br>$1')
-
-    // replace all p tags with line breaks (and spaces) only by single linebreaks
-    // limit linebreaks to max 2 (equivalent to html "br" linebreak)
-    .replace(/(<br ?\/?>\s*){2,}/gim, '<br>')
-    // remove additional linebreaks after p tags
-    .replace(/<\/(p|div|th|tr)>\s*(<br ?\/?>\s*)+\s*<(p|div|th|tr)>/gim, '</p><p>')
-    // remove additional linebreaks inside p tags
-    .replace(/<[a-z-]+>(<[a-z-]+>)*\s*(<br ?\/?>\s*)+\s*(<\/[a-z-]+>)*<\/[a-z-]+>/gim, '')
-    // remove additional linebreaks when first child inside p tags
-    .replace(/<p>(\s*<br ?\/?>\s*)+/gim, '<p>')
-    // remove additional linebreaks when last child inside p tags
-    .replace(/(\s*<br ?\/?>\s*)+<\/p+>/gim, '</p>')
-  return dirty
-}
+import { cleanHtml } from '../middleware/helpers/cleanHtml.js'
 
 const fields = ['content', 'contentExcerpt', 'reasonDescription']
 
 export default {
   Mutation: async (resolve, root, args, context, info) => {
-    args = walkRecursive(args, fields, clean)
+    args = walkRecursive(args, fields, cleanHtml)
     return resolve(root, args, context, info)
   },
   Query: async (resolve, root, args, context, info) => {
     const result = await resolve(root, args, context, info)
-    return walkRecursive(result, fields, clean)
+    return walkRecursive(result, fields, cleanHtml)
   },
 }
diff --git a/cypress/integration/Notification.Mention.feature b/cypress/integration/Notification.Mention.feature
index cadfe11dd..0d3726492 100644
--- a/cypress/integration/Notification.Mention.feature
+++ b/cypress/integration/Notification.Mention.feature
@@ -5,9 +5,9 @@ Feature: Notification for a mention
 
   Background:
     Given the following "users" are in the database:
-      | slug              | email                | password | id       | name              | termsAndConditionsAgreedVersion |
-      | wolle-aus-hamburg | wolle@example.org    | 1234     | wolle    | Wolle aus Hamburg | 0.0.4                           |
-      | matt-rider        | matt@example.org     | 4321     | matt     | Matt Rider        | 0.0.4                           |
+      | slug              | email                | password | id       | name                 | termsAndConditionsAgreedVersion |
+      | wolle-aus-hamburg | wolle@example.org    | 1234     | wolle    | Wolfgang aus Hamburg | 0.0.4                           |
+      | matt-rider        | matt@example.org     | 4321     | matt     | Matt Rider           | 0.0.4                           |
 
   Scenario: Mention another user, re-login as this user and see notifications
     Given I am logged in as "wolle-aus-hamburg"
diff --git a/webapp/components/Registration/RegistrationSlider.story.js b/webapp/components/Registration/RegistrationSlider.story.js
index 9fb1c347f..ef048db47 100644
--- a/webapp/components/Registration/RegistrationSlider.story.js
+++ b/webapp/components/Registration/RegistrationSlider.story.js
@@ -97,7 +97,7 @@ storiesOf('RegistrationSlider', module)
           email: 'wolle.huss@pjannto.com',
           emailSend: false,
           nonce: '47539',
-          name: 'Wolle',
+          name: 'Wolfgang',
           password: 'Hello',
           passwordConfirmation: 'Hello',
           termsAndConditionsConfirmed: true,
@@ -127,7 +127,7 @@ storiesOf('RegistrationSlider', module)
           email: 'wolle.huss@pjannto.com',
           emailSend: false,
           nonce: '47539',
-          name: 'Wolle',
+          name: 'Wolfgang',
           password: 'Hello',
           passwordConfirmation: 'Hello',
           termsAndConditionsConfirmed: true,
@@ -171,7 +171,7 @@ storiesOf('RegistrationSlider', module)
           email: 'wolle.huss@pjannto.com',
           emailSend: true,
           nonce: '47539',
-          name: 'Wolle',
+          name: 'Wolfgang',
           password: 'Hello',
           passwordConfirmation: 'Hello',
           termsAndConditionsConfirmed: true,