In the process of migrating from Exchange 2010 to 2013. So far ok. I'm at the point of migrating mailboxes so the first mailbox was a test mailbox. Migrated easy but when testing I can receive email from internal and external ok but I cannot send to any other receipent either internal or external. I followed the best practices etc. but one thing I didn't see is do I need to create a send connector to the Exchange 2010 box?