Relay via static zz0.email host

Split horizon for the complete .email zone is not feasible for all
sites, and TLS certificate currently does not cover any of the internal
hostnames.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

pillar/global/mta.sls

@@ -17,6 +17,7 @@ postfix:
     smtp_use_tls: 'yes'
     smtp_tls_security_level: encrypt
     smtp_tls_wrappermode: 'yes'
+    disable_dns_lookups: 'yes'
 
   aliases:
     use_file: false

salt/common/hosts.sls

@@ -0,0 +1,9 @@
+# this is a hack because we currently only allow email relaying using the split-horizon zz0.email
+selene-hosts:
+  host.present:
+    - comment: Needed for email
+    - ip: 192.168.0.120
+    - names:
+      - selene.psyched.dev
+      - selene
+      - zz0.email

salt/common/init.sls

@@ -1,3 +1,4 @@
 include:
   - role.salt.minion
+  - .hosts
   - common.{{ grains['os'] | lower }}