✨: add postgrey, treat spamd as milter

roles/postgrey/files/postgrey

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+# postgrey startup options, created for Debian
+
+# you may want to set
+#   --delay=N   how long to greylist, seconds (default: 300)
+#   --max-age=N delete old entries after N days (default: 35)
+# see also the postgrey(8) manpage
+
+POSTGREY_OPTS="--inet=10023 --delay=300 --max-age=365"
+
+# the --greylist-text commandline argument can not be easily passed through
+# POSTGREY_OPTS when it contains spaces.  So, insert your text here:
+#POSTGREY_TEXT="Your customized rejection message here"

roles/postgrey/handlers/main.yml

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+---
+
+- name: Restart postgrey
+  ansible.builtin.service:
+    name: postgrey
+    state: restarted

roles/postgrey/tasks/main.yml

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+---
+
+- name: Install postgrey
+  ansible.builtin.package:
+    name: postgrey
+    state: present
+
+- name: Put main configuration files
+  ansible.builtin.copy:
+    src: files/postgrey
+    dest: /etc/default/postgrey
+    mode: 0644
+  notify:
+    - Restart postgrey