Our clients have started to report that Outlook is throwing an error when trying to send emails through our server:
Sending' reported error (0x800CCC80)
'None of the authentication methods supported by this client are supported by your server.'
Anyone any clue what might be causing this. I was going through our settings checking them against Bruces latest anti-spam settings when this apparently started, but fixing it has baffled me.
We're on SmartMail v13.1.5451
Many thanks ....