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unkyjoe -> Undeliverable ??? (8.Oct.2003 4:22:00 PM)
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Help, we are running a SBS 2003 Server, had exchange 2003 up and running just fine. Yesterday we started receiving the following error when sending out e-mail from Outlook 2003 on our desktops connecting to the 2003 Exchange Server.
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<xxxxxx#5.5.0 smtp;503 This mail server requires authentication. Please check your mail client settings.>
This happens with anybody we send to.
Any ideas of where to start?
Thanks
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