Exchange 2003 server (SBS) running normally without issue until today and suddenly everyone who tried to send an email got bounce with "550 5.7.1 Unable to relay".
Nothing in the system to my knowledge has changed.
Only thing I've been able to do meantime (which has worked) is to change the setting in Exchange System Manager : Default SMTP Virtual server >Properties > Access > Relay from 'Only the list below' to 'All except the list below' but I know this is NOT a recommended configuration!
(Box 'allow all computers which successfully authenticate to relay' remains ticked: did not change this).
If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.
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This video demonstrates how to sync Microsoft Exchange Public Folders with smartphones using CodeTwo Exchange Sync and Exchange ActiveSync.
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