Delivery has failed .... #550 5.1.1 RESOLVER.ADR.ExRecipNotFound
We recently migrated a SBS 2003 to Windows Server 2008 with Exchange 2010 with a new internal domain name:
We cleared out Outlook Nickname Cache of old addresses and replaced with new so to avoid this issue, but when ever a User replies to an email to an internal staff member Outlook will try and send using Old Domain Name.
Can I adjust User Accounts so both are accepted somehow so I dont have to adjust Outlook Nickname Cache etc.?
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