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:
Old: domain.local
New: domain.internal

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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FlippAsked:
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Simon Butler (Sembee)ConsultantCommented:
This blog posting from the SBS team explains everything.
http://blogs.technet.com/sbs/archive/2009/05/21/cannot-reply-to-old-emails-or-modify-old-calendar-items-after-pst-mail-migration.aspx


Cleaning out the nicknames is not enough to stop the problem, you need to have the additional entries, or the users need to be told that when replying to old email to select the recipients fresh.

Simon.
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FlippAuthor Commented:
lol ... yeah just found this and other postings on this.

Thanks Simon.
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FlippAuthor Commented:
Thanks again for quick reply - much appreciated.
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