Added chapter on temp. mail alias

docs/spamalias.md

@@ -0,0 +1,5 @@
+These temporary email aliases are mostly used for places where we need to provide an email address but don't want future correspondence with. They are also called spam alias.
+
+To create, delete or extend a temporary email aliase you need to login to mailcow's UI as a mailbox user and navigate to the tab **Temporary email aliases**:
+
+![How to set spam- or temporary email aliases in mailcow](images/spamalias.png)

mkdocs.yml

@@ -33,6 +33,7 @@ pages:
   - 'mailcow UI':
       - 'Configuration': 'mailcow_ui.md'
       - 'Blacklist / Whitelist': 'bl_wl.md'
+      - 'Temporary email aliase': 'spamalias.md'
       - 'Tagging': 'tagging.md'
       - 'Two-Factor Authentication': 'tfa.md'
   - 'Redis': 'redis.md'