We've configure 2 different AD sites and both the site are configured with Ex2010 SP1 server with different MailboxDB. We are facing problem while trying to send/receive internal email between two sites also cant receive email from the external.
Site-1: CAS + HT + MB (Mailboxdb1)
Site-2: CAS + HT + MB (Mailboxdb2)
Site-1 : Can send and receive mail to the external as well as the Mailboxdb1 but cant send to the Mailboxdb2
Site-2 : Mailboxdb2 users cant send/receive mail to Mailboxdb1 users but can send mail to the external only.
ERROR: There is currently no route to the mailbox database.
Please advise
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