diff --git a/roles/prometheus/templates/blackbox.yml b/roles/prometheus/templates/blackbox.yml
index 455f5a8..cd7b6fe 100644
--- a/roles/prometheus/templates/blackbox.yml
+++ b/roles/prometheus/templates/blackbox.yml
@@ -168,6 +168,34 @@ modules:
       query_response:
         - expect: "^\\* OK .*$"
 
+  managesieve:
+    prober: tcp
+    timeout: 2s
+    tcp:
+      {% if blackbox_prefer_ipv4 -%}
+      preferred_ip_protocol: ip4
+      {% endif -%}
+      tls: true
+      query_response:
+        - expect: ".*SIEVE*"
+        - expect: "^OK .*$"
+
+  managesieve_starttls:
+    prober: tcp
+    timeout: 2s
+    tcp:
+      {% if blackbox_prefer_ipv4 -%}
+      preferred_ip_protocol: ip4
+      {% endif -%}
+      tls: true
+      query_response:
+        - expect: ".*SIEVE*"
+        - expect: "^OK .*$"
+        - send: "STARTTLS"
+        - expect: "^OK .*TLS.*$"
+        - starttls: yes
+        - expect: "^OK .*TLS.*$"
+
   nextcloud_installed:
     prober: http
     http: