Use true instead of yes.

tasks/general/software/sendmail.yml

@@ -10,11 +10,11 @@
 - name: Server | Sendmail | Check
   shell: which postfix
   register: postfix
-  ignore_errors: yes
+  ignore_errors: true
 
 - name: Server | Sendmail | Install
   package:
-    name: 
+    name:
       - "{{ sendmail }}"
     state: present
   when: postfix.failed
@@ -27,8 +27,8 @@
       sendmail_msp_queue_enable="YES"
     marker: "# {mark} MANAGED BY ANSIBLE - sendmail"
     state: present
-    create: yes
-    backup: yes
+    create: true
+    backup: true
   when: postfix.failed and ansible_system == "FreeBSD"
 
 - name: Server | Sendmail | Enable + Start | Main
@@ -36,7 +36,7 @@
     name: "{{ sendmail }}"
     pattern: "{{ sendmail }}"
     state: started
-    enabled: yes
+    enabled: true
   when: postfix.failed
 
 - name: Server | Sendmail | Enable + Start | Queue
@@ -44,5 +44,5 @@
     name: "{{ sendmail_queue }}"
     pattern: "{{ sendmail_queue }}"
     state: started
-    enabled: yes
+    enabled: true
   when: postfix.failed and ansible_system == "FreeBSD"