mastus: enable smtp auth

mastus/mail.nix

@@ -34,6 +34,11 @@
       smtp_tls_mandatory_protocols=!SSLv2,!SSLv3
       smtpd_tls_protocols=!SSLv2,!SSLv3
       smtp_tls_protocols=!SSLv2,!SSLv3
+
+      smtpd_sasl_type = dovecot
+      smtpd_sasl_path = private/auth
+      smtpd_sasl_auth_enable = yes
+      smtpd_tls_auth_only = yes
     '';
   };
 
@@ -46,6 +51,14 @@
     sslServerKey = "/etc/sslcerts/mail-dovecot.key";
     extraConfig = ''
       ssl_protocols = !SSLv2 !SSLv3
+
+      service auth {
+        unix_listener /var/postfix/queue/private/auth {
+          mode = 0660
+          user = postfix
+          group = postfix
+        }
+      }
     '';
   };