Watch mail server with blackbox tcp module

pica-metrologie/blackbox.yml

@@ -22,3 +22,22 @@ modules:
     dns:
       query_name: picasoft.net
       query_type: SOA
+
+  # Probe a Postfix server and check STARTTLS mechanism
+  smtp_check:
+    prober: tcp
+    timeout: 5s
+    tcp:
+      preferred_ip_protocol: "ip4"
+      query_response:
+        # Check that HELO command works
+        - expect: "^220 ([^ ]+) ESMTP (.+)$"
+        - send: "HELO ProberCheck"
+        - expect: "^250(.+)"
+        # Upgrade to TLS and check that HELO still works
+        - send: "STARTTLS"
+        - expect: "^220(.+)"
+        - starttls: true
+        - send: "HELO ProberCheck"
+        - expect: "^250(.+)"
+        - send: "QUIT"

pica-metrologie/vmagent-prom.yml

@@ -184,6 +184,19 @@ scrape_configs:
       target_label: instance
     - target_label: __address__
       replacement: blackbox.picasoft.net
+  # Srape metrics about Picasoft mail server
+  - job_name: blackbox-mail
+    scheme: "https"
+    basic_auth:
+      username: "%{BLACKBOX_METRICS_USER}"
+      password: "%{BLACKBOX_METRICS_PASSWORD}"
+    metrics_path: /probe
+    params:
+      module: [smtp_check]
+      target: [mail.picasoft.net:587]
+    static_configs:
+      - targets:
+        - blackbox.picasoft.net
     # Scrape metrics about Blackbox itself
   - job_name: blackbox
     scheme: "https"