Add mail and it@ address

docs/index.md

@@ -3,3 +3,5 @@
 Here, you’ll find all documentation needed to use the CCCV services which we use for the event organization.
 
 See the menu for the different services.
+
+If you have any problems, you can contact the administration team at `it [at] cccv dot de`.

docs/mail.md

+# Mail
+
+If you have access to the mail server, configure your mail client with the following settings:
+
+## POP3
+
+POP3 is not supported.
+
+## IMAP (read mails)
+
+* Server: `imap.cccv.de`
+* Port: `993`
+* Encryption: `SSL/TLS`
+* Username: Your LDAP user name
+
+## SMTP (send mails)
+
+* Server: `mail.cccv.de`
+* Port: `587`
+* Encryption: `STARTTLS`
+* Username: Your LDAP user name