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450 4.7.1 <FQDN>: Helo command rejected: Host not found RRS feed

  • Question

  • Helo,

    The issue is I am not able to send email to the domain saigonco-op.com.vn from my exchange email. But can send from other emails systems like yahoo etc.

    Getting NDR:

    #550 4.4.7 QUEUE.Expired; message expired ##

     While trying to send email from telnet session, I am getting the following issue:

    RCPT TO:phong-hv@saigonco-op.com.vn
    450 4.7.1 <fqdn>: Helo command rejected: Host not found

    Same error can also get from send connector protocol logs

    Kindly help

    Manu


    Regards from www.windowsadmin.info | www.blog.windowsadmin.info
    Monday, October 10, 2011 8:56 AM

Answers

  • On Mon, 10 Oct 2011 08:56:20 +0000, ManU PhiliP wrote:
     
    >The issue is I am not able to send email to the domain saigonco-op.com.vn from my exchange email. But can send from other emails systems like yahoo etc.
    >
    >Getting NDR:
    >
    >#550 4.4.7 QUEUE.Expired; message expired ##
    >
    > While trying to send email from telnet session, I am getting the following issue:
    >
    >RCPT TO:phong-hv@saigonco-op.com.vn 450 4.7.1 <fqdn>: Helo command rejected: Host not found
     
    What data did you put into the HELO command? Whatever you used, it
    must be found in a publically accessible DNS.
     
    >Same error can also get from send connector protocol logs
     
    So what does your server put into the HELO or EHLO it sends? It should
    be sending the FQDN for the IP address it uses when it sends e-mail to
    other Internet servers. I'm going to guess that it's using an internal
    name, like myserver.mydomain.local. Change the FQDN of the sned
    connector to use name.domain.com (or whatever name is applicable).
     
    ---
    Rich Matheisen
    MCSE+I, Exchange MVP
     

    --- Rich Matheisen MCSE+I, Exchange MVP
    • Marked as answer by Gavin-Zhang Monday, October 24, 2011 3:29 AM
    Monday, October 10, 2011 7:19 PM
  • Hi ManU PhiliP,

    Any update for your issue?
    It could be cuased by the FQDN of send connector point to non-public FQDN .
    Above gave some good information.
    What is your ptr record, and then confirm the the FQDN configured in the send connector.

    Regards!
    Gavin
    TechNet Subscriber Support in forum
    If you have any feedback on our support, please contact tngfb@microsoft.com
    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.



    • Edited by Gavin-Zhang Tuesday, October 11, 2011 9:26 AM
    • Marked as answer by Gavin-Zhang Monday, October 24, 2011 3:29 AM
    Tuesday, October 11, 2011 9:26 AM

All replies

  • On Mon, 10 Oct 2011 08:56:20 +0000, ManU PhiliP wrote:
     
    >The issue is I am not able to send email to the domain saigonco-op.com.vn from my exchange email. But can send from other emails systems like yahoo etc.
    >
    >Getting NDR:
    >
    >#550 4.4.7 QUEUE.Expired; message expired ##
    >
    > While trying to send email from telnet session, I am getting the following issue:
    >
    >RCPT TO:phong-hv@saigonco-op.com.vn 450 4.7.1 <fqdn>: Helo command rejected: Host not found
     
    What data did you put into the HELO command? Whatever you used, it
    must be found in a publically accessible DNS.
     
    >Same error can also get from send connector protocol logs
     
    So what does your server put into the HELO or EHLO it sends? It should
    be sending the FQDN for the IP address it uses when it sends e-mail to
    other Internet servers. I'm going to guess that it's using an internal
    name, like myserver.mydomain.local. Change the FQDN of the sned
    connector to use name.domain.com (or whatever name is applicable).
     
    ---
    Rich Matheisen
    MCSE+I, Exchange MVP
     

    --- Rich Matheisen MCSE+I, Exchange MVP
    • Marked as answer by Gavin-Zhang Monday, October 24, 2011 3:29 AM
    Monday, October 10, 2011 7:19 PM
  • Hi ManU PhiliP,

    Any update for your issue?
    It could be cuased by the FQDN of send connector point to non-public FQDN .
    Above gave some good information.
    What is your ptr record, and then confirm the the FQDN configured in the send connector.

    Regards!
    Gavin
    TechNet Subscriber Support in forum
    If you have any feedback on our support, please contact tngfb@microsoft.com
    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.



    • Edited by Gavin-Zhang Tuesday, October 11, 2011 9:26 AM
    • Marked as answer by Gavin-Zhang Monday, October 24, 2011 3:29 AM
    Tuesday, October 11, 2011 9:26 AM