For the past several days, I’ve been unable to send or reply to emails with Outlook 365 which is connected to a remote Exchange server. Prior to this, everything worked fine.
My laptop and all other devices at home can send emails from the same account so I know the problem does not lie with my router, my exchange server, or problems with the recipient’s email address.
When attempting to send an email, I immediately get a message in my inbox from ‘System Administrator’ that says:
Your message did not reach some or all of the intended recipients.
Subject: Test Desktop 1:46
Sent: 5/18/2020 1:47 PM
The following recipient(s) cannot be reached:
'firstname.lastname@example.org' on 5/18/2020 1:47 PM
This message could not be sent. Unknown Error. Try sending the message again later, or contact your network administrator.
Diagnostic information for administrators:
Error is [0x80040900-0x80040900-0x000003ee].
Submit-Message failed: message id(4), failure enum(6), HResult(0x80040900), EC(0).
In checking with Microsoft’s forums, I’ve eliminated the other potential problem areas and think Webroot Secure Anywhere must suddenly be blocking the connection. Again, everything was working fine up until a few days ago and is still working on my laptop, phone, and tablet.
Can you help?