My company has recently purchased Office365 exchange services. We have configured IMAP settings to our Windows Live Mail Version 2012 (Build 16.4.3508.0205). Everything was working fine until a few days ago, where 2 of the accounts suddenly couldn't send
out emails any more but able to receive emails.
As below are the error message (I have removed email address due to privacy issue):
The message could not be sent because the server rejected the sender's email address. The sender's email address was '*** Email address is removed for privacy ***'.
Subject 'Re: PIs'
Server Error: 421
Server Response: 421 4.3.2 Service not available
Server: 'smtp.office365.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): Yes
I have done some research online, and I'm very sure that I have done the settings correctly. The "My server requires authentication" box is checked as well. As mentioned above, everything is working fine until few days ago where it suddenly fails
to receive emails. I've checked with Office365 team on the user account status, it is working on Webapp Outlook and Exchange mode in Microsoft Outlook so there's nothing wrong with the exchange server.
I'm running out of ideas and hopefully anyone here can lend a helping hand.
Many thanks.
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