We recently migrated our users away from SBS 2011 to full Exchange 2010. The new Exchange server is on a new domain and a completely different server. We had to do mailbox export and imports using New-MailboxExportRequest and New-MailboxImport Request. Emails exported and imported fine but we're now experiencing an issue when a user tries to reply to an email that was imported they get an Undeliverable email. If they reply, delete the recipient name and re-populate it then it works. Any idea why this is happening and how I can fix it?
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