Added mail and XMPP to contact

content/contact.md

@@ -11,3 +11,6 @@ If you have my phone number, **only** through:
 
 I do **not** use WhatsApp or Telegram **for personal conversations**.\
 Write to me using one of the three recommendations mentioned.
+
+If you want to use mail instead, just write a mail to kontakt [at] my domain name.\
+For XMPP, it is iroxol [at] netinfection.xyz.