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outbound tests fail

    Question

  • Exchange 2010 DAG

    We have 2 Exchange sites within the organization with same @fqdn.com but with different outbound IP addresses. Using the Exchange connectivity tester I see that one of mine fails due to a missing PTR record so I need to contact my ISP to add "another" address to the "same" host name? Is this correct, is this best practice? No problem with multiple addresses to the same public name?


    • Edited by jamicon Thursday, March 29, 2012 3:13 PM
    Thursday, March 29, 2012 3:05 PM

Answers

  • Jamicon

    Yes you will need to reach out to your ISP on location 2 and tell them the IP address you are using  on your Exchange servers ( sec
    location) missing  corresponding PTR record.

    In your Scenario
    Two Exchange Servers

    Exc1=Public IP =
    X.X.X.X----------> Location A  ( ISP A)

    Exc2=Public IP =
    X.X.X.X----------> Location B   ( ISP B )


    Both IP address will require PTR record on the public DNS servers, same zone the A record has been created.


    You also do need MX record , ( this is in place already) looking at your scenario , since you are allowing mail to go out from either location, you many want to have second MX record pointing to second location with highest priority.

    So it would look like this

    Mail.yourCompany.com = X.X.X.X= Location A  MX= 10

    Mail.yourCompany.com = Y.Y.Y.Y= Location B  MX= 20

    X.X.X.X= Location A ( ISP DNS )  PTR Exist

    Y.Y.Y.Y= Location B  ( ISP DNS ) PTR Exist

    best

    oz


    Oz Casey, Dedeal MCITP (EMA), MCITP (EA), MCITP (SA) Visit smtp25.blogspot.com Visit Telnet25.wordpress.com   This posting is provided AS-IS with no warranties or guarantees and confers no rights.

    • Marked as answer by jamicon Monday, April 02, 2012 5:38 PM
    Friday, March 30, 2012 2:28 PM
  • As mentioned before, create 2 for each external IP matching the host name.

    Sukh

    • Marked as answer by jamicon Monday, April 02, 2012 5:38 PM
    Friday, March 30, 2012 11:26 PM

All replies

  • Hi,

    you have to configure a second send-connector for the second site in Exchange 2010 environment. Or if the properties are the same just bind your second transport server to the connector using the source server tab.

    start  Exchange Management Conseole - Organization Configuration - Hub Transport - send Connector


    regards Thomas Paetzold visit my blog on: http://sus42.wordpress.com


    • Edited by Peddy1st Thursday, March 29, 2012 6:03 PM
    Thursday, March 29, 2012 5:57 PM
  • yes, wev'e already done that, I'm refering to the ISP's PTR DNS records.

    Reverse DNS lookup failed.


    Thursday, March 29, 2012 6:14 PM
  • You should have a PTR record for each IP that send out email.

    Sukh

    Thursday, March 29, 2012 8:08 PM
  • hi,

    PTR records are created for IP addresses, not domain names.  So if you have two different ip address, you should create two PTR record for the two address.

    Hope can help you

    thanks,


    CastinLu

    TechNet Community Support

    Friday, March 30, 2012 6:36 AM
  • thank you for the reply.

    a PTR record has to resolve to something.

    Let me try again.

    When I use the Exchange connectivity outbound test on colo1 ip address it resolves to the name mail.domain.com successfully

    When I do the same test on colo2 I get "Reverse DNS lookup failed"

    So obviously I need to register a PTR record for the colo2 ip address, right??? So specifically do I tell them the same FQDN as above?

    Friday, March 30, 2012 1:28 PM
  • Jamicon

    Yes you will need to reach out to your ISP on location 2 and tell them the IP address you are using  on your Exchange servers ( sec
    location) missing  corresponding PTR record.

    In your Scenario
    Two Exchange Servers

    Exc1=Public IP =
    X.X.X.X----------> Location A  ( ISP A)

    Exc2=Public IP =
    X.X.X.X----------> Location B   ( ISP B )


    Both IP address will require PTR record on the public DNS servers, same zone the A record has been created.


    You also do need MX record , ( this is in place already) looking at your scenario , since you are allowing mail to go out from either location, you many want to have second MX record pointing to second location with highest priority.

    So it would look like this

    Mail.yourCompany.com = X.X.X.X= Location A  MX= 10

    Mail.yourCompany.com = Y.Y.Y.Y= Location B  MX= 20

    X.X.X.X= Location A ( ISP DNS )  PTR Exist

    Y.Y.Y.Y= Location B  ( ISP DNS ) PTR Exist

    best

    oz


    Oz Casey, Dedeal MCITP (EMA), MCITP (EA), MCITP (SA) Visit smtp25.blogspot.com Visit Telnet25.wordpress.com   This posting is provided AS-IS with no warranties or guarantees and confers no rights.

    • Marked as answer by jamicon Monday, April 02, 2012 5:38 PM
    Friday, March 30, 2012 2:28 PM
  • As mentioned before, create 2 for each external IP matching the host name.

    Sukh

    • Marked as answer by jamicon Monday, April 02, 2012 5:38 PM
    Friday, March 30, 2012 11:26 PM