diff --git a/README.md b/README.md
index 104df96..f5aa0a5 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,9 @@ Mandatory variable:
 - `cron_email`: Sender email address used by cron
 - `exim_etc_mailname`: Exim4 /etc/mailname (default: inventory_hostname)
 
+Optional settings:
+- `exim_skip_install`: Skip installing Exim4 as MTA (default `false`)
+
 ### Docker
 Optional variable:
 - none
diff --git a/defaults/main.yml b/defaults/main.yml
index b9d8ee2..dd8bbc9 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -11,3 +11,4 @@ telegraf_unifi_file: "telegraf-UniFi.conf.j2"
 telegraf_airmax_file: "telegraf-AirMAX.conf.j2"
 
 exim_etc_mailname: "{{ inventory_hostname }}"
+exim_skip_install: false
diff --git a/tasks/cronmails.yml b/tasks/cronmails.yml
index 4dea06e..8fe3760 100644
--- a/tasks/cronmails.yml
+++ b/tasks/cronmails.yml
@@ -3,6 +3,7 @@
 
 # Install and configure exim
 - name: cronmails - Install exim4
+  when: not exim_skip_install
   ansible.builtin.include_tasks: "{{ item }}"
   with_first_found:
     - "cronmails-{{ ansible_distribution }}.{{ ansible_distribution_release }}.yml"