feat: add necessary bits to rewrite sender and recipient for external relay

roles/smtprelay/tasks/main.yml

@@ -4,6 +4,11 @@
     file: stunnel.yml
   when: smtprelay_port not in [587]
 
+- name: Include SMTP remapping
+  ansible.builtin.include_tasks:
+    file: smtp_remap.yml
+  when: smtprelay_origin not in ["mateu.be"]
+
 - name: Install postfix smtp server
   ansible.builtin.package:
     name: postfix

roles/smtprelay/tasks/smtp_remap.yml

@@ -0,0 +1,12 @@
+---
+
+- name: "Create {{ item.destination }}"
+  ansible.builtin.copy:
+    dest: "{{ item.destination }}"
+    mode: 0644
+    content: |
+      {{ item.content }}
+  loop:
+    - {destination: "/etc/postfix/recipient_canonical", content: "/.+/ root@mateu.be"}
+    - {destination: "/etc/postfix/header_check", content: "/From:.*/ REPLACE From: root@{{ smtprelay_origin }}"}
+    - {destination: "/etc/postfix/sender_canonical_maps", content: "/.+/ root@{{ smtprelay_origin }}"}

roles/smtprelay/tasks/stunnel.yml

@@ -1,21 +1,21 @@
 ---
 
 - name: Install stunnel
-  package:
+  ansible.builtin.package:
     name: stunnel4
     state: present
 
 - name: SMTP wrapper
-  template:
+  ansible.builtin.template:
     src: smtp-wrapper.conf.j2
     dest: /etc/stunnel/smtp-wrapper.conf
     mode: 0644
   notify: Restart stunnel4
 
 - name: Rewrite var smtprelay_host
-  set_fact:
+  ansible.builtin.set_fact:
     smtprelay_host: "localhost"
 
 - name: Rewrite var smtprelay_port
-  set_fact:
+  ansible.builtin.set_fact:
     smtprelay_port: "2{{ smtprelay_port }}"

roles/smtprelay/templates/main.cf.j2

@@ -8,6 +8,13 @@ myorigin = {{ smtprelay_origin }}
 # Uncomment the next line to generate "delayed mail" warnings
 #delay_warning_time = 4h
 
+{% if smtprelay_origin not in ["mateu.be"] %}
+recipient_canonical_maps = regexp:/etc/postfix/recipient_canonical
+sender_canonical_classes = envelope_sender, header_sender
+sender_canonical_maps =  regexp:/etc/postfix/sender_canonical_maps
+smtp_header_checks = regexp:/etc/postfix/header_check
+{% endif %}
+
 alias_maps = hash:/etc/aliases
 alias_database = hash:/etc/aliases
 mydestination = $myhostname, localhost.$mydomain, localhost