Add no spam rule

content/mail.md

@@ -79,9 +79,16 @@ on your computer. In addition, SOGo provides an address book and calendar.[^6]
 SOGo is separate from [bobamail ui](https://mail.boba.best/), which is Mailcow's
 UI, for changing various settings.
 
+#### Calendar and Address Book
+
+SOGo also provides a calendar and contacts system. You can access them through
+the webmail interface, or by connecting them to your devices using CalDAV and
+CardDAV.[^7]
+
 [^1]: https://mailcow.github.io/mailcow-dockerized-docs/u_e-rspamd/
 [^2]: https://mailcow.github.io/mailcow-dockerized-docs/u_e-rspamd/#spam-filter-thresholds-global
 [^3]: https://mailcow.github.io/mailcow-dockerized-docs/u_e-rspamd/#learn-spam-ham
 [^4]: https://mailcow.github.io/mailcow-dockerized-docs/u_e-mailcow_ui-spamalias/
 [^5]: https://mailcow.github.io/mailcow-dockerized-docs/u_e-mailcow_ui-tagging/
 [^6]: https://mailcow.github.io/mailcow-dockerized-docs/u_e-sogo/
+[^7]: https://mailcow.github.io/mailcow-dockerized-docs/client/client-manual/#contacts-and-calendars

content/rules.md

@@ -12,6 +12,7 @@ General guidelines and rules for boba.best.
 - Use common sense
 - Don't break the law (this server is hosted in Germany, but I live in the US)
 - No piracy
+- No spam, advertising, or other junk that no one wants
 - Sensitive content must be marked (the "Subject" field of a status is
   considered a Content Warning)
   - NSFW