Cannot achieve Exchange Server authentication to 2010 Exchange server from 2016 Exchange server

Published: 14/11/2019
Cannot achieve Exchange Server authentication to 2010 Exchange server from 2016 Exchange server
Source: SERVERFAULT.COM

I am in the process of migration Exchange 2010 to 2016 server. Currently I have installed Exchange 2016 which is co-existing with 2010. I have created a test mailbox on the 2016 server. I am able to send e-mails to the test 2016 mailbox from 2010 mailboxes both internal and from public. However I cannot send any e-mails from the 2016 mailboxes to the existing 2010 mailboxes and also to any public

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