add quota warnings

files/quota-warning.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+PERCENT=$1
+USER=$2
+cat << EOF | /usr/lib/dovecot/dovecot-lda -d $USER -o "plugin/quota=maildir:User quota:noenforcing"
+From: postmaster@cccv.de
+Subject: Quota warning
+
+Your mailbox is now $PERCENT% full.
+Please consider archiving larger files in Nextcloud - a mail server is not a document archive.
+EOF

tasks/main.yml

@@ -30,6 +30,15 @@
     group: vmail
     mode: '0750'
 
+- name: Create quota warning script
+  copy:
+    src: quota-warning.sh
+    dest: /usr/local/bin/quota-warning.sh
+    owner: vmail
+    group: vmail
+    mode: '554'
+  when: dovecot.quota
+
 - name: copy dovecot config
   template:
     src: "{{ item.src }}"

templates/90-quota.conf.j2

@@ -109,4 +109,20 @@ service quota-status {
   }
   client_limit = 1
 }
+
+plugin {
+  quota_warning = storage=10%% quota-warning 10 %u
+  quota_warning2 = storage=80%% quota-warning 80 %u
+}
+
+service quota-warning {
+  executable = script /usr/local/bin/quota-warning.sh
+  # use some unprivileged user for executing the quota warnings
+  user = vmail
+  unix_listener quota-warning {
+    user = vmail
+    group = vmail
+  }
+}
+
 {% endif %}