We can receive mail from external users but we cannot send mail to external recipients RRS feed

  • Question

  • Hi, We have an AD

    With subdomain

    We installed exchange 2010  to

    Mail addresses are like


    We can receive mail  from external users but we cannot send mail to external recipients


    Cannot send mail to with error #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

    Cannot send mail to gmail and yahoo recipient.. It just queues up in exchange

    Send connector network is u”use MX records to route mail automatically”



    Any known issue?




    Tuesday, November 26, 2013 3:12 AM

All replies

  • Hi Mgerio,

    Check if you have in the accepted domain list

    Is it happening for all domains or for particular domains
    If its happening for all domains Was there any recent change on firewall settings
    If its happening only for yahoo & gmail domains then please try dropping an email
    through telnet  to yahoo id or gmail id and see if its successful
    Enable verbose logging on the send connector and see if it gives us any information in the verbose logs
    Try message tracking and see where the delivery gets failed

    Also you can try with creating a dedicated send connector for Yahoo and gmail and try dropping an email to them and check if its successful

    Let me know if you need any help on this

    Please mark as helpful if you find my contribution useful or as an answer if it does answer your question.
    That will encourage me - and others - to take time out to help you.

    Tuesday, November 26, 2013 3:40 AM