Maybe just since the Windows 10 update 2-3 weeks ago, when I send emails to an address ending in @mchsi, I receive this error message back; any ideas as to why?
I'm not using Windows Mail, I just use Edge to access my email server.


Your message has been delayed and is still awaiting delivery
to the following recipient(s):

(the recipients address listed here)

'MX' record resolution failed. (DNS operation refused.)