Add (initial) postfix role

roles/postfix/handlers/main.yml

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+---
+# Restart Postfix
+- name: Restart postfix service
+  service:
+    name: postfix
+    state: restarted

roles/postfix/tasks/main.yml

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+---
+# Install and configure Postfix
+
+- name: Install Postfix
+  apt:
+    name: postfix
+    update_cache: true # apt update beforehand
+
+- name: Configure Postfix
+  template:
+    src: main.cf.j2
+    dest: /etc/postfix/main.cf
+  notify: Restart postfix service
+
+

roles/postfix/templates/main.cf.j2

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+# {{ ansible_managed }}
+# See /usr/share/postfix/main.cf.dist for a full commented version
+# See BASIC_CONFIGURATION_README and STANDARD_CONFIGURATION_README for more insights
+# More generally, see the Postfix documentation at http://www.postfix.org
+
+smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
+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
+
+# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
+# fresh installs.
+compatibility_level = 2
+
+# Send mail as user@{{ myorigin }}
+# myorigin = auro.re
+myorigin = {{ myorigin }}
+
+#myhostname = mail.adm.auro.re
+myhostname = {{ myhostname }}
+
+mydestination = $myhostname localhost.{{ myorigin }} localhost {{ myorigin }}
+
+# Specify the trusted networks
+mynetworks = 127.0.0.0/8 {{ local_network }}
+
+# This host does not relay mail from untrusted networks
+relay_domains =
+
+# Allow plus delimiter
+recipient_delimiter = +