Sign outgoing emails using DKIM

admin/freeposte/admin/models.py

@@ -55,6 +55,8 @@ class Domain(Base):
 
     @property
     def dkim_publickey(self):
+        dkim_key = self.dkim_key
+        if dkim_key:
             return dkim.strip_key(self.dkim_key).decode("utf8")
 
     def generate_dkim_key(self):

admin/freeposte/admin/templates/domain/details.html

@@ -31,6 +31,7 @@ Domain details
 {{ domain.name }}. 600 IN TXT "v=spf1 mx a:{{ config["HOSTNAME"] }} -all"
 {{ domain.name }}. 600 IN SPF "v=spf1 mx a:{{ config["HOSTNAME"] }} -all"</pre></td>
     </tr>
+    {% if domain.dkim_publickey %}
     <tr>
       <th>DKIM public key</th>
       <td><pre style="white-space: pre-wrap; word-wrap: break-word;">{{ domain.dkim_publickey }}</pre></td>
@@ -43,6 +44,7 @@ Domain details
       <th>DNS DMARC entry</th>
       <td><pre>_dmarc.{{ domain.name }}. 600 IN TXT "v=DMARC1; p=reject; rua=mailto:{{ config["POSTMASTER"] }}@{{ config["DOMAIN"] }}; adkim=s; aspf=s"</pre></td>
     </tr>
+    {% endif %}
   </tbody>
 </table>
 {% endblock %}

rmilter/rmilter.conf

@@ -117,3 +117,14 @@ greylisting {
 	awl_ttl = 3600s;
 };
 
+dkim {
+	domain {
+		key = /dkim;
+    domain = "*";
+    selector = "dkim";
+	};
+  header_canon = relaxed;
+  body_canon = relaxed;
+  sign_alg = sha256;
+  auth_only = no;
+};