Fix the creation of the letsencrypt hook for postfix.

library/roles/postfix-relay/tasks/postfix-letsencrypt-hook.yml

@@ -1,4 +1,8 @@
 ---
+- name: Create the acme hooks directory if it does not exist
+  file: dest=/usr/lib/acme/hooks state=directory
+  tags: [ 'postfix', 'postfix-relay', 'postfix_letsencrypt', 'letsencrypt' ]
+
 - name: Install a hook for letsencrypt
   template: src=postfix-letsencrypt-hook dest=/usr/lib/acme/hooks/postfix owner=root group=root mode=4555
-  tags: [ 'postfix', 'postfix-relay' ]
+  tags: [ 'postfix', 'postfix-relay', 'postfix_letsencrypt', 'letsencrypt' ]

library/roles/postfix/tasks/postfix-letsencrypt-hook.yml

@@ -1,8 +1,18 @@
 ---
+- name: Manage the letsencrypt hook for postfix
+  block:
   - name: Create the acme hooks directory if it does not exist
-  file: dest=/usr/lib/acme/hooks/postfix state=directory
-  tags: [ 'postfix', 'postfix-relay', 'letsencrypt' ]
+    file: dest=/usr/lib/acme/hooks state=directory
+
+  - name: In the past we created a directory instead of a file. Check if it's the case
+    stat: path=/usr/lib/acme/hooks/postfix
+    register: postfix_hookdir
+
+  - name: Remove the wrong directory if it's present
+    file: dest=/usr/lib/acme/hooks/postfix state=absent
+    when: postfix_hookdir.stat.isdir is defined and postfix_hookdir.stat.isdir
 
   - name: Install a hook for letsencrypt
-  template: src=postfix-letsencrypt-hook dest=/usr/lib/acme/hooks/postfix owner=root group=root mode=4555
-  tags: [ 'postfix', 'postfix-relay', 'letsencrypt' ]
+    template: src=postfix-letsencrypt-hook dest=/usr/lib/acme/hooks/postfix owner=root group=root mode=0555
+
+  tags: [ 'postfix', 'postfix_letsencrypt', 'letsencrypt' ]

library/roles/postfix/tasks/smtp-sasl-auth.yml

@@ -1,7 +1,7 @@
 ---
 - name: Write sasl hash file
   template: src=sasl_passwd.j2 dest=/etc/postfix/sasl_passwd owner=root group=root mode=0400
-  when: postfix_use_sasl_auth
+  when: postfix_use_sasl_auth | bool
   register: update_sasl_hash
   tags: postfix-relay