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Coexistence 2003/2010 - configure 2010 to send emails to internet

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  • Coexistence 2003/2010 - configure 2010 to send emails to internet

    Hi Folks

    Back again on this swap over.

    Now everything working for users on our new 2010 CAS/HUB/Mailbox server and our old exchange 2003 server with users able to access and send mail via outlook,mobile, outlook anywhere.

    The issue I have came across today is that I can see the email is flowing in via the exchange 2010 server but when a user sends a email externally it still sends it via the 2003 server which now has a different NAT public IP address for the legacy.domain.com and my MX record points to the new 2010 server and we are starting to get bounced emails after the recipients server checks the sending IP does not match our MX record.

    This happens for mailboxes on the 2010 and 2003 server.

    Just tried deleting the Internet SMTP connector on the 2003 serverto see if it would then route via the connector between the exchange 2003/2010 server and then restarted SMTP but all external mail then stopped.

    Anyone any ideas on this apart from a second MX record pointing to the old 2003 server.

    Thanks

  • #2
    Re: Coexistence 2003/2010 - configure 2010 to send emails to internet

    Do you have an internet send connector configured on the ex10 server?
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    • #3
      Re: Coexistence 2003/2010 - configure 2010 to send emails to internet

      Hi

      Yes as the test mailboxes I have on the 2010 server are sending out directly via this.

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      • #4
        Re: Coexistence 2003/2010 - configure 2010 to send emails to Internet

        There must be something wrong with the Send Connector on Exchange 2010 and Exchange is ignoring it. I would start by deleting the connector and recreating it.

        MX records are not the issue for email delivery, it is PTR (aka reverse DNS) that will cause the problems (or not).

        Simon.
        --
        Simon Butler
        Exchange MVP

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