diff --git a/tasks/configure_dbmail_users.yml b/tasks/configure_dbmail_users.yml
index 1b60a04..d93239c 100644
--- a/tasks/configure_dbmail_users.yml
+++ b/tasks/configure_dbmail_users.yml
@@ -1,12 +1,12 @@
 ---
 - name: Ensure user accounts are present
-  shell: "dbmail-users -a {{ item.username }}"
+  shell: "dbmail-users -a '{{ item.username }}'"
   loop: "{{ dbmail_users }}"
   register: result
   failed_when: result.rc > 1
 
 - name: Set user accounts password
-  shell: "dbmail-users -c {{ item.username }} -w {{ item.password}} -p {{ item.password_type | default('sha512') }}"
+  shell: "dbmail-users -c '{{ item.username }}' -w '{{ item.password}}' -p '{{ item.password_type | default('sha512') }}'"
   loop: "{{ dbmail_users }}"
   register: result
   failed_when: result.rc > 1
@@ -14,14 +14,14 @@
   when: "'password' in item"
 
 - name: Link user accounts with emails
-  shell: "dbmail-users -c {{ item.username }} -s {{ item.emails | join(',') }}"
+  shell: "dbmail-users -c '{{ item.username }}' -s '{{ item.emails | join(',') }}'"
   loop: "{{ dbmail_users }}"
   register: result
   failed_when: result.rc > 1
   when: "'emails' in item"
 
 - name: Set user accounts quota
-  shell: "dbmail-users -c {{ item.username }} -m {{ item.quota | default('1024M') }}"
+  shell: "dbmail-users -c '{{ item.username }}' -m '{{ item.quota | default('1024M') }}'"
   loop: "{{ dbmail_users }}"
   register: result
   failed_when: result.rc > 1