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

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 }}"}