Unable to send message

Posted on 2009-12-29
Last Modified: 2012-05-08

I am unable to send message to outside domain for particular user. Other domains it is working fine however particular person it is not going on very domain. Others I can send on the very domain.
I am getting following error. There is no NK2 cache file, I have checked in server the mail flow setting is okay.

Please help.

Delivery has failed to these recipients or distribution lists:
Microsoft Exchange has been trying to deliver this message without success and has stopped trying. Please try sending this message again, or provide the following diagnostic text to your system administrator.
Question by:kunalclk
    LVL 81

    Expert Comment

    Hello kunalclk,

    Seems you have problem with domain name resolution.
    Or the domain don't accept mail from your IP.

    Are you blacklisted ?
    Test with this tools :

    LVL 2

    Author Comment

    no, also i can sebd\email on gmail but but not to him.
    LVL 81

    Expert Comment

    Check if you're blacklisted
    LVL 2

    Author Comment

    there is no blacklist issue everything seems good. I am not sure why am I getting the error.
    LVL 65

    Accepted Solution

    The message you have posted doesn't really explain anything about what is happening. It may well be a straight time out.
    If it is a one specific user, then get them to test through OWA, by manually typing the address in. Then use Message Tracking see if there is a delivery attempt.


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