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Mail flow in a 2013/2010 coexistence

    Question

  • Hi all,

    We are in the middle of a 2010 to 2013 migration. I am trying to understand the mail flow before I decommission one of the 2010 server.

    Background

    root domain: test.com

    child domain: a.test.com

    Prior to migrating users from child domain to root domain, we are migrating users from exchange 2010 server in the child domain (exch01.a.test.com) to new exchange 2013 servers in root domain (exch01 and exch02.test.com). All mailboxes have been migrated to new servers. Hub01.test.com and edge servers are to stay until we migrate to Office 365.

    All roles are shown in diagram below. So is exch01.a.test.com required for inbound mail from external? There is no mailbox on it and it is clear from any relay (e.g. printers and scanners). Mail flows are shown in diagram,

    1) as outbound

    2) as inbound.

    Based on email header analysis, sometime inbound mails are going through exch01.a.test.com and other times are not. Is anyone able to explain?

    Thanks,

    Will


    Tuesday, November 8, 2016 6:13 AM

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