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Exchange 2013 can't send email to external users such as xxx@outlook.com

    Question

  • Hi Experts,

    I have configured an Exchange server 2013 in an Azure virtual machine for test purpose. However, I can't send email to ANY external users such as xxx@outlook.com. I run the powershell  get-queue |fl. Here is the error. Any ideas?


    Friday, July 13, 2018 4:18 AM

Answers

  • Hi Jianggai,

    Does the issue only occur when sending to outlook.com domain ? If sending an email to other domains, such as a gmail user, is there the same issue?

    Please also check if your firewall or ISP block the outbound traffics on port 25, that would be a common cause.


    Best Regards,
    Niko Cheng


    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.


    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Monday, July 16, 2018 2:14 AM
    Moderator
  • Error 451.4.4.0 in Exchange occur when we  send email to specific remote domains

    Ref: https://support.microsoft.com/en-us/help/3038746/451-4-4-0-dns-query-failed-exchange-server-error-in-message-queue

    To know How to Resolve Exchange 2013 not Sending External Emails Error, Check Out this Blog:
    Solutions to Fix Error   -  Error 451.4.4.0 

    1) Fix Microsoft Exchange Server not sending External Mail Via PowerShell Commands
    2) Create New Send Connector to fix Exchange 2013 not sending External Mail

    Visit Blog: https://it.toolbox.com/blogs/manishg/how-to-resolve-exchange-2013-not-sending-external-emails-error-050218  to know how to create Send Connector.

    Hope Solution works for you.

    • Marked as answer by jianggai 13 hours 49 minutes ago
    Monday, July 23, 2018 6:54 AM

All replies

  • Hi Jianggai,

    Does the issue only occur when sending to outlook.com domain ? If sending an email to other domains, such as a gmail user, is there the same issue?

    Please also check if your firewall or ISP block the outbound traffics on port 25, that would be a common cause.


    Best Regards,
    Niko Cheng


    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.


    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Monday, July 16, 2018 2:14 AM
    Moderator
  • Error 451.4.4.0 in Exchange occur when we  send email to specific remote domains

    Ref: https://support.microsoft.com/en-us/help/3038746/451-4-4-0-dns-query-failed-exchange-server-error-in-message-queue

    To know How to Resolve Exchange 2013 not Sending External Emails Error, Check Out this Blog:
    Solutions to Fix Error   -  Error 451.4.4.0 

    1) Fix Microsoft Exchange Server not sending External Mail Via PowerShell Commands
    2) Create New Send Connector to fix Exchange 2013 not sending External Mail

    Visit Blog: https://it.toolbox.com/blogs/manishg/how-to-resolve-exchange-2013-not-sending-external-emails-error-050218  to know how to create Send Connector.

    Hope Solution works for you.

    • Marked as answer by jianggai 13 hours 49 minutes ago
    Monday, July 23, 2018 6:54 AM