Cannot send to a particular domain because of security policies RRS feed

  • Question

  • Hi

    My client has SBS 2008 and exchange 2007, when he tries to send and email to seznam.cz he gets the following message:

    Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

    The following organization rejected your message: mx50.seznam.cz.

    He could send to this domain before he changed to the exchange server. I have asked the client to ask the recieving domain client to add them to the safe list, I have also checked if he is on any blacklist but he isn't



    Thursday, August 11, 2011 2:46 PM


All replies

  • Does domain seznam.cz use any spam solution for filter email from internet ?. Do you have vallid SRV record for your domain, It can create problem by some domain those do reverse DNS lookup.
    Anil MCC 2011,ITIL V3,MCSA 2003,MCTS 2010, My Blog : http://messagingschool.wordpress.com
    Thursday, August 11, 2011 5:08 PM
  • Hi Anil

    I have checked on MXtoolbox and the reverse DNS points to remote.clientdomain.co.uk. Is this what you mean? and im not sure if seznam.cz uses any spam solution as i am not directly in contact with them and they are based in czech republic so it is not easy to get in touch in them.

    Is there anything else i should check?



    Friday, August 12, 2011 8:21 AM
  • Hi Mahesh,

    Please go to https://www.testexchangeconnectivity.com/ to check the Outbound SMTP E-Mail and post the results here.

    You can also to use Telnet to test the connection:

    Telnet to Port 25 to Test SMTP Communication


    Frank Wang

    Forum Support

    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.


    • Marked as answer by emma.yoyo Friday, August 19, 2011 2:07 AM
    Saturday, August 13, 2011 8:30 AM
  • Hi Mahesh,

    Any updates?

    Frank Wang

    Tuesday, August 16, 2011 1:36 AM
  • Hi Mahesh,

    Any updates?

    Frank Wang

    Thursday, August 18, 2011 1:30 AM