first install new mta, then remove postfix

roles/server/tasks/utilities/mail_transfer_agent.yml

@@ -1,14 +1,5 @@
 - name: server | utilities | {{ mta_package }}
   block:
-    - name: server | utilities | remove postfix
-      package:
-        name: 
-          - postfix
-          - postfix-ldap
-          - postfix-mysql
-          - postfix-sqlite
-          - postgrey
-        state: absent
     - name: server | utilities | install {{ mta_package }}
       package:
         name: "{{ mta_package }}"
@@ -24,4 +15,13 @@
         - { regex: "^mailhub=.*", line: "mailhub=mail.universe.local"}
         - { regex: "^hostname=.*", line: "hostname={{ ansible_fqdn }}"}
       when: ansible_distribution in ["Debian", "Pop!_OS", "Ubuntu", "Linux Mint"]
-  when: postfix is not defined or postfix == false and not (is_proxmox is defined and is_proxmox == true)
+    - name: server | utilities | remove postfix
+      package:
+        name: 
+          - postfix
+          - postfix-ldap
+          - postfix-mysql
+          - postfix-sqlite
+          - postgrey
+        state: absent
+  when: postfix is not defined or postfix == false