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.)

We switched over to Office 365 and Outlook 365 in Jan 2021. We have noticed that it is normal for messages to be delayed 1-2 hours on occasion but in these cases we get no error message back in our email. In two instances, random messages were delayed by 8 hours. This is normal for this product, possibly due to high volume, or perhaps by a cluster of servers being down on the Microsoft end.



You may want to post this on a networking forum as the MX record is more of a networking issue and I'm not a network guy.

Thanks for your reply. I don't have either of the 365s. After a week or so, the problem stopped.