@yorkman I also tested mail configuration. For me it work with STARTTLS on port 587. I don't use self signed certificates. Now here are several ideas mentioned. 1. try to create a new receive...

@bbro Sounds like a bug.

@yorkman yorkman wrote [...] I suppose someone else would report this problem by now but I guess that depends on how popular this router is and when the controller software was released as it's also...

@bbro any other dhcp servers in your network?

@yorkman Right, that's not the problem. I don't use mail feature.

@yorkman seems yorkman wrote @S-K Programs (except outlook of course) on my local subnet don't need authentication [...] For security reasons I would strongly recommend to allow machines at ip level...