extend template, shamelessly stolen from: http://russell.ballestrini.net/postfix-salt-state-formula/

postfix/aliases

@@ -0,0 +1,3 @@
+# Managed by config management
+# See man 5 aliases for format
+{{pillar['postfix']['aliases']}}

postfix/init.sls

@@ -5,3 +5,57 @@ postfix:
     - enable: True
     - require:
       - pkg: postfix
+    - watch:
+      - pkg: postfix
+      - file: /etc/postfix/main.cf
+
+# postfix main configuration file
+/etc/postfix/main.cf:
+  file.managed:
+    - source: salt://postfix/main.cf
+    - user: root
+    - group: root
+    - mode: 644
+    - template: jinja
+    - require:
+      - pkg: postfix
+
+# manage /etc/aliases if data found in pillar
+{% if 'aliases' in pillar.get('postfix', '') %}
+/etc/aliases:
+  file.managed:
+    - source: salt://postfix/aliases
+    - user: root
+    - group: root
+    - mode: 644
+    - template: jinja
+    - require:
+      - pkg: postfix
+
+run-newaliases:
+  cmd.wait:
+    - name: newaliases
+    - cwd: /
+    - watch:
+      - file: /etc/aliases
+{% endif %}
+
+# manage /etc/postfix/virtual if data found in pillar
+{% if 'virtual' in pillar.get('postfix', '') %}
+/etc/postfix/virtual:
+  file.managed:
+    - source: salt://postfix/virtual
+    - user: root
+    - group: root
+    - mode: 644
+    - template: jinja
+    - require:
+      - pkg: postfix
+
+run-postmap:
+  cmd.wait:
+    - name: /usr/sbin/postmap /etc/postfix/virtual
+    - cwd: /
+    - watch:
+      - file: /etc/postfix/virtual
+{% endif %}

postfix/main.cf

@@ -0,0 +1,43 @@
+# Managed by config management
+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+
+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+#myorigin = /etc/mailname
+
+smtpd_banner = $myhostname ESMTP $mail_name
+biff = no
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+
+readme_directory = no
+
+# TLS parameters
+smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
+smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
+smtpd_use_tls=yes
+smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
+# information on enabling SSL in the smtp client.
+
+myhostname = {{ grains['fqdn'] }}
+alias_maps = hash:/etc/aliases   
+alias_database = hash:/etc/aliases
+mydestination = {{ grains['fqdn'] }}, localhost
+relayhost = 
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+mailbox_size_limit = 0
+recipient_delimiter = +
+inet_interfaces = all
+
+{% if 'virtual' in pillar.get('postfix','') %}
+virtual_alias_maps = hash:/etc/postfix/virtual
+{% endif %}
+

postfix/virtual

@@ -0,0 +1,2 @@
+# Managed by config management
+{{pillar['postfix']['virtual']}}