Problem with mail servers?

Does anyone else have any issues today connecting to the mail servers? I also didn’t receive mail back on some urgent mails, making me question whether my mails were sent properly last night, or whether maybe replies did not arrive. That was when I could still log in earlier today. For the past 45min or so I’ve not been able to log in at all. So I just wondered if more people have the problem, or maybe it’s something on my end.