hack: restart dovecot from time to time

pastila/imap.nix

@@ -37,4 +37,12 @@
     ];
     group = config.services.dovecot2.group;
   };
+
+  # XXX *shrug*
+  services.cron = {
+    enable = true;
+    systemCronJobs = [
+      "0 2 * * * root systemctl restart dovecot2.service"
+    ];
+  };
 }