Mail From Internet is not receiving into my domain


  • In environment have two Exchange servers of version 2013.

    Suddenly mails from internet are not coming into Domain , after 24 hours getting "Mail failure notice".

    Please help me out to resolve this issue immediately.

    Monday, June 6, 2016 6:20 AM

All replies

  • Hi,

    For your question, I want to confirm:
    1. Does it works before, and do you have modify settings for Exchange server or firewall?
    2. How about mail flow for internal or send message to internet?
    3. Is there NDR or error return to sender?

    Please post the more information for further assistance, also use Telnet to try to send message to Exchange server. For your reference:

    Moreover, please use NSLOOKUP to check the DNS A record and MX record. Also, ensure port 25 is opening.

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

    Allen Wang
    TechNet Community Support

    Tuesday, June 7, 2016 8:06 AM
  • Yes it was working before , no changes had in server or firewall.

    Internal mail flow is working fine.

    Yes getting NDR [Postmaster mail] to sender.

    Note : At times suddenly external mails are receiving. 

    • Edited by Kannatcs Wednesday, June 8, 2016 7:10 AM
    Wednesday, June 8, 2016 6:17 AM